Sed last match command. The p command prints the lines that match the pattern.
Sed last match command a text Append text, which has each embedded newline preceded by a backslash. My file looks like this, from another SO question : 3. $//' The regex used is . You Jul 31, 2014 · I wrote the following awk to print lines from the match line until EOF awk '/match_line/,/*/' file How can I do the same in sed? Sep 14, 2016 · Change last character in line with sed Hot Network Questions American sci-fi comedy movie with a young cast killing aliens that hatch from eggs in a cave and take over their town Nov 6, 2012 · @user1190650 That would work if you want to see the "Here is a" as well. ie. jar I am wondering does sed allow you to do something like java regex, you define the pattern like: Feb 22, 2016 · Consider this example: aaa bbb pattern1 aaa pattern2 bbb ccc pattern2 ddd eee pattern1 fff ggg Now, I want to print everything between the first instance of pattern1 starting at the beginning of a line and pattern2 starting at the beginning of another line. gz$//g'` Anyway, what this command does is remove the trailing . Replace selection. Later, I will have a . unix is free os. If you just want the part between "one is" and "String", then you need to make the regex match the whole line: sed -e 's/. s etc. "Add a new line" learn operating system. Jul 11, 2014 · According to your comment you "HAVE TO match against the last line", so I would consider using the $ (last line) and i (insert command) in sed. The sed command can add a new line before a pattern match Feb 27, 2015 · This command should do the trick (providing you are looking at myfile. The second solution uses the \b word boundary. Note that including the g (global) flag will cause sed to replace all instances of $old within the first matching line: Mar 1, 2024 · Here are some key takeaways when utilizing sed for last match replacements: Structure scripts around lines and addressability instead of files; Use buffers judiciously to avoid off-by-one errors ; Prefer anchored regex over positional specifiers for robustness; Validate on sample datasets first before running recursively sed 's/\(. Here's an updated example, given the text in your initial post: sed -i '' '/<\/preferences>/i\ ADD SOME TEXT\ ADD SOME MORE TEXT\ ' test. You need to do this in order to create a single string for sed. Share. sh changepwd. You could also do the extraction of the path in two steps: Remove everything up to and including the backquote, and then remove everything after and including the single quote. Jun 18, 2014 · As per the Avinash Raj solution you got what you want but you want some explaination about some parameter used in sed command . The required syntax is in bold. Mar 2, 2015 · sed '/SCF Done/h;g;$!d' <filename> This puts each match into the hold buffer (the h). And also it is printing the complete range. (Note that sed counts lines continuously across all input files unless -i or -s options are specified. Done in Command mode, of course:set wrapscan. Notice, match up-until \n newlnie chaaracter, doing. sed -n '/Section1/ , /Section. S. txt You can make sure your replacement is acted by adding the -i option which will modify the file in-place, make sure it's exactly what you are expecting before though. To do that, the answer from dnsmkl is the way to go with sed. txt|tail -n 2 For more info on tail use man tail. Of course more efficient suggestions are welcome! Doesn't my sed command say, replace all stuff before 'NUM:' with '' (empty)? Aug 9, 2023 · Here are some examples of how to use regular expressions with the sed command: Match a Pattern. txt | cut -d \" -f2 I tried to use sed on top of it, with this line Mar 26, 2015 · The benefit of using tail instead of sed is that tail starts at the end of the file until it reaches a newline, while sed would have to traverse the whole file until it reaches the end, and only then return the text since the last newline was found. jar/ s/$/ proxyPort=8080/' this command should append string only if the line is uncommented 0 comment and uncomment a specific lines starting with spaces Sep 3, 2023 · sed 's/: The sed command and the beginning of the substitution expression. *[/]//' in_file. Word=. line 3 4. Jan 6, 2014 · But as the man page for sed says, that matches all occurrences within two lines with 'trigger'. The output (3 lines containing aaa) is then filtered so that only the last line is Feb 13, 2009 · simple pattern match with awk, sed: alenD: Linux - Newbie: 10: 03-10-2008 02:31 PM: grep/sed/awk - find match, then match on next line: gctaylor1: Programming: 3: 07-11-2007 08:55 AM: sed display line after pattern match: inonzi_prowler: Linux - Software: 3: 02-19-2007 01:47 PM: how to use the sed w option to redirect pattern match to file sed -i ‘’ -e '/javaagent. . csv | awk '/,$/ && !handled { sub(/,$/, ""); handled++ } {print}' | tac The awk command is a simple one to do the substitution the first time the pattern is seen. Aug 3, 2021 · If you want to modify the file itself, this is easy with ed:. line 2 3. txt > newfile. printf "%s\n" '/(RM0/;//,$ d' w | ed -s file. Using that page I actually came up with a working command $ sed '/out_time=/h; $!d; x' progress. /{p}' Oct 16, 2015 · Find 'Last' using sed and pipe it to tail command which print last n lines of the file -n specifies the no. line 4 I want to change some names in a file using sed. Most characters are ordinary: they stand for themselves in a pattern, and match the corresponding characters in the subject. Let's say I want to delete all lines that start with Don't and then the 2 lines that follow. Sep 17, 2017 · I am making a script to collect a value from an external file. Apr 2, 2012 · Print the current line and fetch the next into the pattern space with the ncommand. The p command prints the lines that match the pattern. That means that it should be possible to process lines by rolling pairs, at the expense of an unreadable and unmaintainable sed script. An address is either a line number or the Using sed, I would like to print the last matching line of a file. He gave me this: ipcs -qa | sed 's Mar 2, 2015 · Currently I am using a piped command: sed -n '/SCF Done/p' <filename> | sed '$!d' I would like to replace that command by combining it somehow, but I was yet unable to do so. txt > out_file. Command Example Description; p: sed -n '1,4 p' input. to match the last char Mar 3, 2015 · @Psirus I hope this isn't going to open up a can of worms, but the idea of using lesser operations is to showcase a certain level of mastery of the lesser operations. info) states for "FLAGS g": "Apply the replacement to _all_ matches to the REGEXP, not just the first. m. Output The “cat” function displays the file contents, and then we will replace the first instance of "easy" with "hard" using a SED command. gz extension from the filename, which isn't what you're looking for according to your question. you can use 'e' to pass matched group to external command/tools within sed command. Apr 3, 2020 · You can also use this minor change to make your original sed command work. How to fix my sed syntax in order to replace OLD with NEW only if COMMAND is the first word in line? (Note: COMMAND word location could be after some spaces from the line Aug 21, 2015 · \w* matches the last word inside of the file and $ anchors the search to the end of the line. As such, I am avoiding using -n and /p in my solution space. bashrc file that contains a collection of regex patterns. Mar 18, 2024 · Lastly, we use our earlier one-liner substitution command to match the pattern twice and show them on separate lines. My exact usage would be: $ echo 'cd / Nov 2, 2016 · sed -n Suppresses output by default /PATTERN/ is the pattern you want to match; H Appends the current, matching, line to the hold buffer $ Addresses the last line of input (available only on GNU sed) x Exchange the contents of the hold and patter buffer; s/. sed line 4: invalid reference \\9 on `s' command's RHS My sed c The only problem here is it will also cut the last separator character ('/'), but if you really need it you can still simply put it back after the "loop" finished, just append this additional command at the end of the previous command line: Jun 3, 2013 · The following should work (note that on some systems you may need to remove all of the comments): sed '1 { # if this is the first line h # copy to hold space d # delete pattern space and return to start } /^}},$/ { # if this line matches regex /^}},$/ x # exchange pattern and hold space b # print pattern space and return to start } H # append line to hold space $ { # if this is the last line x Apr 22, 2013 · It isn't necessary to use / as the regex delimiter. First one is . line 4 ## Changelog ## 3. Using the Output of the sed Command Writing a File. xx2" " Jan 28, 2015 · If you qualify word to mean any sequence of 1 or more non-blank characters then the answer is definitely yes, and it is very simply done as well. *\n(. – Kent. I want sed to quit after the first match, so the output would be: trigger text1 text2 trigger That is, unlike the ed command, which cannot match a new-line character in the middle of a line, the sed command can match a new-line character in the pattern space. \( : The opening parenthesis [ ( ] enclosing the subexpression, preceded by a backslash ( \ ). A sed command to swap first and last character of each line. For example, @Thor's answer shows an appreciation of bash parameter expansion feature, which works well if OP is using bash too. Feb 11, 2013 · The proper, portable way to encode multi-line insertion sed scripts is to: Precede the actual content with a newline, Escape each newline (including the first one, after the command) with a backslash. sed '/unix/ a "Add a new line"' file. This effectively Oct 1, 2012 · Is there a one-line sed command that I can use? sed; If you don't want a colon after the last word, you can use GNU sed like this: sed -n 's/=. I want to use sed for that. Great! We’ve got this one right! 5. * will match all lines. Then, after it reads the entire file, it reads the hold buffer (the g) and prints only the last line (the $!d). txt The reason that old. SED command can also be used for deleting lines from a particular file. You will have to save three lines in a buffer (named hold space), do a pattern search with the newest line and print the oldest one if it matches: sed -n ' ## At the beginning read three lines. To know how to use sed, people should understand regular expressions (regexp for short). Nov 14, 2012 · The equivalent sed command is butt ugly: sed -e : The sed command above will omit last 5 lines. */\1/'. The trick here is to match the last part of the file names using regex patterns. of lines to be read from end of the file, here I am reading last 2 lines of the file. Jan 29, 2016 · This should match: sed 's/[a-z][ ]*[a-z][ ]*[0-9]*//gi' Your 1st try misses a couple of square brackets, and you don't need the outermost one: sed 's/[a-z][[:space May 16, 2017 · How can I do if I want to get everything after the first = or : using sed? In this example, I would like to get the result . txt is likely because your regular expression ^*\n is not matching any lines in old. Code $ cat file. txt). Specifically I want the <filename> to come last. – May 12, 2019 · I'm trying to delete a range using sed. May 3, 2023 · @DaveGriffiths: you're right — drat! Manual says "[2addr]n Write the pattern space to the standard output if the default output has not been suppressed, and replace the pattern space with the next line of input. For this we find first occurrence by reversing the file. May 26, 2022 · I want to match and print about hundred lines after n-th match of log number lines. sed -n 2p somefile. txt Edit: You can also improve the performance using the tip that manatwork mentions in his comment: sed -n '2{p;q}' somefile. txt $ sed '1 s/easy/hard/' file. Redirect control back using the ba command which is essentially a goto to the a place holder. Mar 26, 2021 · I'm using sed for updating my JSON configuration file in the runtime. Delete the last occurence of a string in a file in unix/linux. Start next cycle. I used to commit those kind of things when Python was not available. If you feel annoyed to, you can choose to put -r option which enables regex extended mode and forget about backslash escapes on brackets. 2 Selecting lines with sed. sh baconSoda. txt > new. I need to remove everything after the period (. txt out_time=00:00:07. sed -r 's/([^-\t]*\t){3}. sed '/^this:/ { :k ; n ; // b k ; N ; N ; N ; d }' input_file It uses a loop which prints the current line and reads the next one (n) while it keeps matching the regex (the empty regex // recalls the latest one evaluated, i. The below three sed commands are able to print the second-to-last line. Slower way, without:set wrapscan. This is because [[:blank:]]* and [^[:blank:]]* are boolean complements and - provided all characters in a string are complete - [[:blank:]]*U[^[:blank:]]* can describe any possible string in much the same way . txt with data like: START 03:11:30 a 03:11:40 b END START 03:13:30 eee 03:13:35 fff END jjjjjjjjjjjjjjjjjjjjj START 03:14:30 eee 03:15:30 fff END ggggggggggg iiiiiiiiiiiiiiiiiiiiiiiii I want the below output START (13 Replies) Mar 7, 2014 · How to use sed to modify last 2 digit of a line when a string matches in a file Hot Network Questions What kind of cosmic event could justify the entire Solar System being uninhabitable in the near future (1000 years or less)? You can associate a block with the first check and put the second in there. Sometimes, when the pattern doesn't match in the JSON file, sed still exits with return code 0. But I need to replace a "pat Mar 30, 2015 · Using sed without tac: sed -n '/Name/h; //!H; ${g;p}' file When Name is seen, replace the hold space with the current line; When Name is NOT seen, append the current line to the hold space; At the last line, replace the pattern space with the hold space and print. the last match. Jan 16, 2019 · If I correctly remember, sed (the good old default sed, not GNU one) has a notion of pattern space and hold space, and command to exchange them. it will delete all characters after that. unixlinux which one you choose. Jul 7, 2013 · I want to grab the last two numbers (one int, one float; followed by optional whitespace) and print only them. txt This first sets the current line to the first one matching the regular expression (RM0, then deletes everything from the next line that matches the same RE to the end of the file, and writes the modified file back to disk. 0 abc cat 2. The same holds if you are using OS X sed, but then you need to use sed -E: May 17, 2013 · Another way of doing this in plain bash is making use of the rev command like this:. Oct 19, 2012 · You can extract the last numbers with this: sed -e 's/. txt Jul 29, 2016 · I have to replace a "pattern" with a "string" on the second-to-last line of the file - file. Jul 7, 2012 · I have a list like this: 5678:robert dylan :d. Also /log. txt 08022222222 bla bla bla > Primarily I would like to understand what's wrong with my understanding of SED. Using Hold Space tac | sed -z 's@</script>@&\nsomething@' | tac Because sed works on first occurence, to get the last occurence you can: tac - reverse the lines; sed -z - parse the stream as zero separated and then; tac reverse the lines again. sh encryptxt. Is there anyway you can do regex match group using sed like java regex pattern/match/group? if i have string like . Is there a way to do that? While I would prefer a solution with sed, I am open to other command line tools. Check using sed ':a;/0$/{N;s/\n//;ba}' verbatim Jun 11, 2015 · Stack Exchange Network. 4 abc elephant 1. I have a MASSIVE file that I'm running sed against and I really need to stop processing the millisecond I get a match. grep -o "test=". *\)String. For example: Jun 7, 2018 · And this command: sed -n '/^Four$/,/^[^[:blank:]]/p' I get the following output: Four five six Seven How can I change this sed expression to not match the final line of the output? So the ideal output should be: Four five six I've tried many things involving exclamation points but haven't managed to get close to getting this working. [^:]* : The first subexpression of the search term contains a group in square brackets. *\n){2}/gm (printing 2 lines after match) works on regex101 but not on my terminal (sed doesn't match \n). A simple example is changing "my" in the "file1" to "yours Oct 5, 2016 · with the grep command and cut, I manage to get the value between the quotation mark. This is a GNU extension. For Ex: Below is the data in file, A|2121212|666666666 | 2|01|2 |B|1111111111 |234234234 |000 Nov 3, 2019 · $ matches the last line (it's a normal sed address; 4aTEXTTOEND would insert after the fourth line), a is the append command, and TEXTTOEND is what to append, filename is the file where the TEXTTOEND will be inserted Jul 8, 2020 · This might work for you (GNU sed): sed '1b;$b;d' file All sed commands can be prefixed by either an address or a regexp. See man sed:-r, --regexp-extended use extended regular expressions in the script. Returning 0 means successful Jul 12, 2016 · First replace all the newlines with a unique character that does not occur anywhere else in your file (e. Example: foo bar <foo> bla 1 2 3. Nov 30, 2011 · I have the following command : sed -i -e '/match1/,+2d' filex, which deletes 2 lines after finding the match "match1" in the file "file x". Running the rex command against the _raw field might have a performance impact. The key insights are: Using backreferences – Capture preceding text till last match. 3. 0. sed: search and replace values at position for last line of file 4 Replace a string, but only when it is the last occurance of that string before a specific line Apr 26, 2012 · I recently asked someone at work about how to take the output of ipcs -qa and make it space delimited, so I can parse it/store it in the database for monitoring. Both for strings and files. May 7, 2013 · @BernieReiter ^\s*$ will match all "empty" lines, All matched lines will be removed by sed, with the d command. * does. That is, unlike the ed command, which cannot match a new-line character in the middle of a line, the sed command can match a new-line character in the pattern space. Go to the first line and just search Backwards! 1G?pattern. the number of the line in file file containing the last occurrence of the regex. txt is coming out as new. :marketing :04/19/43 85000 I want to show only the name and designation of the person. Mar 13, 2014 · I want to remove parts of a file starting from a match (including the first match) and until the second match (excluding the second match). This command will still wait for sed to complete before outputting the top result. */\1/' films. Reversing file contents – First match turns to last occurrence. ) first~step This GNU extension matches every stepth line starting with line I wrote a sed command to swap the second and sixth character in the numbers below. The full documentation for sed is maintained as a Texinfo manual. I want to add several matches to it, like match1, match 2 . Recall that . I want to substitue matching strings on all but the first occurrence of a line. txt and then deleting the original line. Note, that sed "COMMANDS" INFILE > INFILE will not work, but destroy the INFILE immediately; a popular, clever, but disfunctional idea. This might work for you (GNU sed): Use greed to swallow up the pattern space and then regexp engine will step back through the line and find the first match i. You can use # or @ when your regular expressions contain / that you would otherwise need to escape. Sed examples. Also print the line number along with output. 1. Aug 3, 2015 · You can specify a range of lines to operate on. Now, let’s see our script in action: $ sed -n -E -f match_multiline. 0), sed now does support the I flag for case-insensitive matching, so the command in the question should now work (BSD sed doesn't report its version, but you can go by the date at the bottom of the man page, which should be March 27, 2017 or more recent); a simple example: May 22, 2015 · To provide an awk-based alternative that is easier to understand:. So the sed command replaces the text from second line to last line in the file. By using the $ we force the . tac reverses the order of the lines in the file, so the awk command ends up removing the last comma. And also next section name also coming. Replace the last match in a file Oct 21, 2014 · I have tried to search for last occurrence in a file using sed. Also \n is a gnu extension, for posix sed use a literal newline in pattern match inside s command. sed -n '/Section1/,4{p}' Here i could able to remove the hardcoding. For example: sed -n '/male/ { /oxford/ p; }' file Or invert the check and action: May 25, 2014 · With a single script passed to sed, a literal newline is required to terminate the a (append) command argument, as shown in the first form (otherwise, GNU sed won't recognize the closing }); you can alternatively use two -e options, and pass the } via the second one, as shown in the second form; the third form splices in a(n ultimately) literal Jan 29, 2012 · Now it happens that in some csv-files there are "fictive dates" like 20000500 that can't be imported to SQL because of the last two zeros (that are not possible for dates). Please note that I am also doing substitutions in a sed command file. Examples: 1. 2 and I want to replace last word from a line which contains 'elephant' with string which I know. sed s/'\w*$'// old. In the first command, you have: sed '/aaa/!d' | sed '$!d' The first sed here deletes each line that is not aaa. As a trivial example, the pattern That is, unlike the ed command, which cannot match a new-line character in the middle of a line, the sed command can match a new-line character in the pattern space. A regular expression is a pattern that is matched against a subject string from left to right. * in regex matches on the "greediest match" principle, that is it will match as far to the right as it can. Deleting lines from a particular file. 47 water. rex [field=<field>] ( <regex-expression> [max_match=<int>] [offset_field=<string>] ) | (mode=sed <sed-expression>) Required Aug 17, 2022 · QUESTION: Is it possible to use sed to substitute last, last 2nd, last 3rd, last 4th (and so on) match (occurrence)? If yes, how? NOTE: Any approach that converts these numeric values to something specific to sed (a bash function, for example) is also acceptable. Commented Feb 26, 2017 at 19:41. Also & in replacement pattern in sed means the whole matched pattern. The range is from a known match and the next 2 lines. How can I edit my sed-command to always change the last two digits to 01 in such cases (I mean only if they are 00)? I tried The rating of this answer is surprising ;s (this surprised wink emoticon pun on sed substitution is intentional) given the OP specifications: sed join lines together. *\)|/\1`/' Or use: sed 's/|\([^|]*\)$/`\1/' To match on | followed by something that doesn't contain | til the end of line as already shown by Toby, but that approach only works for single character replacements. Explanation: G go to the last line. *\)String/\1/'. sed '/Last/ p' yourfile. Because multiple lines are loaded into pattern space, doing ex. Since we don't have sed in a pipeline, you can use -i to replace the file. txt: 95 flour. The repeated lines can be separated and with other lines between them like Jan 30, 2017 · The command to insert before is i (the one before "New Text", not the sed option): sed -i '/pattern/iNew Text' input_file This command inserts what you want before the line that matches your pattern, but if you want to insert something before the match itself, use a replacement with a capture group. The end-of-file condition is naturally taken care of by the n command which terminates any further sed commands if it tries to read passed the end-of-file. May 30, 2024 · For those who look for efficiency (many files to process, or huge files), using the + repetition operator instead of * makes the command more than twice faster. *//; H; $ { g; s/\n Jul 10, 2017 · Using the following sed command i can match files r1 r2 but not r10 r11 and r99. However if I have some-string-8 -x --command acommand, the output of executing that command is some-string-0. *\n// Replaces everything including the last newline in pattern buffer. txt Search for a string but only output lines that do not match $ sed -n '/hello Delete the last line in If you're not interested in lines outside of the range, but just want the non-inclusive variant of the Iowa/Montana example from the question (which is what brought me here), you can write the "except for the first and last matching lines" clause easily enough with a second sed: Jan 27, 2020 · The backquote needs to be escaped since this expression is within double quotes (it would be the start of a command substitution in the shell otherwise). SED command is used for performing deletion operation without even opening the file . In HP-UX tac option is not available. I tried like this . From the sed(1) man page: $ Match the last line. test-artifact-201251-balbal-0. *NUM://' data. Jun 15, 2013 · sed -n '/a/=' file outputs the numbers of the lines (function =) matching regex a, and tail -n 1 extracts the output's last line, i. Move to the end of that line $? search Backwards for pattern. " | tr "\n" "," Basically, you reverse the lines of the file, then split them with cut using space as the delimiter, take the first field that cut produces and then you reverse the token again, use tr -d to delete unwanted chars and tr again to replace newline Question: I'd like to print a single line directly following a line that contains a matching pattern. Feb 9, 2015 · if your sed is GNU sed. this solution works, but I don't want to type a 100 Ns in my sed command. G$?pattern. Sep 25, 2012 · T label If no s/// has done a successful substitution since the last input line was read and since the last t or T command, then branch to label; if label is omitted, branch to end of script. *Age\n/&Gender\n/ # add the 2nd new line after the last Age bb # and we are done: goto b } ba # goto a :b } ' users. "Add a new line" Add a line before a match. We can do this using the command: $ sed 's/txt$/sh/' baeldungScripts. Syntax. This submission's last comment "if that's the case check what @ninjalj submitted" also suggests checking the same answer. I came across. Apr 29, 2021 · Using sed and assuming you want the two lines after the last match of pattern (and additionally assuming that each line matching pattern is at least two lines apart from any other matching line): $ cat file a b pattern c the 1st d the 2nd e the 3rd 1 2 3 pattern 4 the first 5 the second 6 the third 7 Jun 19, 2016 · sed -e "$(grep -n 'thing4' file |tail -1|cut -f1 -d':')a foo" file Use the shell and grep to obtain the last line number that contains the pattern, then use that number as the address for the sed append command. 1-SNAPSHOT. The "a" command to sed tells it to add a new line after a match is found. May 21, 2013 · For those not wanting to use the -P flag; no other extended regex that is supported by the default grep will do what the \K does, but you could simply pipe it through sed: grep -o 'name="[^"]* | sed 's/name="//g' Mar 13, 2012 · So now when I try to sed it, I always get the last number on the line: >sed 's/. Let’s see the entire series of commands in action: I want to change in file in each line the last match to the XXXX Given the file format: "192. Aug 19, 2019 · sed 's/^. sed players_multiline. line 4 ## Screenshots ## 1. You can test it out: echo "Here is a one is a String" | sed -e 's/one is\(. Bart and my second is =Homer I am using sed 's/. jar how do I use sed just to get the result like: test-artifact-0. With the sed command the substitute command s changes all occurrences of the regular expression into a new value. This is how the file looks like: #! /bin/bash SAMPLE="sample_name" FULLSAMPLE="full_sample_name" Apr 23, 2021 · The echo command output is piped into the sed command using the | (pipe) command – no source text file is specified as the input text is read from the piped input. Oct 27, 2017 · A fun way to do this, is to use rev to reverse the characters of each line and write your sed replacement backwards. Feb 8, 2012 · well, maybe my question was incomplete. * will match greedily as much as possible. My target is to replace the OLD to NEW only if COMMAND word appears as the first word in the line. sed: return last occurrence match until end of file. sed '/\bfoo\b/d' file The first solution uses \< start word and \> end word. For example, to operate on all lines, (which is of course the default): sed -e "1,$ s/a/b/" But I need to operate on all but the last line. Jun 15, 2013 · The first command appends an a and the second deletes the last line. 0. So whether somethingelse or somethingnew are part of the match doesn't matter, we're matching all chars until we find the last / char in the line. My version of sed will not take the following syntax (it bombs out on +1p) which would seem lik Apr 6, 2013 · The standard manual page for GNU sed is very poor describing s and flag g, but the (text)info page (sed. your command works for this fien. I have tried the Jan 22, 2015 · Use /2 as an argument to the s command sed only the last match pattern. 3 days ago · Here, we will use ‘1’ in the SED command to match the first instance of the pattern. unix is opensource. /^this:/, and the command b k goes back to the label k on a match). How can I tell sed to replace only the last occurence? If there's no way to solve it using sed (as said in comments), please provide alternatives reaching the same result, thanks. ^) using tr. sh Aug 24, 2012 · If you are using GNU sed then you need to use sed -r which forces sed to use extended regular expressions, including the wanted behavior of +. The second and third commands give no output. If the info and sed programs are properly installed at your site, the command info sed should give you access to the complete manual. Addresses in a sed script can be in any of the following forms: number Specifying a line number will match only that line in the input. May 25, 2021 · Deletes all but the last line number outputted by the first step (using $!d, "if this is not the last line, delete it"), and creates a two-line sed script that would modify the last matching line by first reading sample1. Deleting the data before character match. P. With GNU sed: Jan 14, 2024 · We can easily replace the extensions at the end using sed. But it has the line number hard coding. *one is\(. txt Mar 25, 2015 · sed ' /Surname/ { # we have seen the first pattern, insert the 1st new line i Name :a N # append the next line to pattern space $ { # if this is the last line s/. unix is great os. " Dec 10, 2012 · I use the following sed command to remove the line number string from file sed -i s'/line number//g' file but what I need to change in sed syntax in order to remove the line number only if it ex Mar 17, 2012 · So to reiterate the question, when you match on one line, you want to append a string to the next line---a line that already exists, rather than adding a new line after it with the new data. 168. I want some-string-0 -x --command acommand – Jan 11, 2019 · This might work for you (GNU sed): sed '/\<foo\>/d' file Or. however, I would like only the matching line itself, not any range of lines. command: s for substitution. sed -i "0,\|$old|{s|$old|$new|g}" file should work (although the brackets around the substitute expression are unnecessary, since it is a single expression). 4 Should print: 2 3. Replace a Oct 14, 2019 · I want to achieve this with sed not using awk. * test. 6. May 11, 2024 · One approach could be: sed ' # replace *all* OLDs with newline: s/OLD/\ /g :1 # replace one newline back to a OLD as long as it is # followed by at least 3 newlines, relying on the fact # that the first . The output of the sed command can be sent to a file by using the > command: sed -n '' test. awk '!found && /testing/ { print "tested"; found=1 } 1' file found is used to keep track of whether the first instance of testing has been found (variable found, as any Awk variable, defaults to 0, i. n read the next input line and starts processing the newline with the command rather than the first command. Mar 5, 2019 · I have file like abc dog 1. The dual of \b is \B so to delete lines that contain foobar or foobaz but not foo only, use: sed '/\bfoo\B/d' file Mar 8, 2015 · Stack Exchange Network. There's a solid reason for the discrepancy in the behaviour. The first backwards match will be the same as the last forward match Jul 23, 2017 · While this is definitely the simplest approach I will say it doesn't work for my use-case at all. To match a pattern in a file, use the following command: sed -n '/pattern/p' filename In this command, /pattern/ is the regular expression that matches the pattern you are looking for. d Delete pattern space. Certain commands called addressed commands allow you to specify one line or a range of lines to which the command should be applied. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. *[=:]//' right now but I get Homer as result (everything after the last = or :) and I would like to get everything after the first, and not the last = or : Apr 24, 2013 · How can I ensure sed only grabs '192. cat file | rev | cut -d" " -f1 | rev | tr -d ". xx2" "someting" "another2321SD" I want to have: "192. I am getting the following error: sed: file minor1. Jul 26, 2019 · The second snipped for example uses ^Word=[^\n]* to match from the beginning to the end of line. is a regex meta char to match anything (except newline) $ is the end of line anchor. line 1 2. 0 could you show your current sed command is and example data please How to match sed pattern Oct 20, 2010 · Yes, this command will work properly with your example. Jun 10, 2014 · First generate all the unique strings ( First Name, Last Name in this case ) Now find the last occurrence each of these strings. – Aug 18, 2011 · You don't really need Sed, but if the pourpose is to learn you can use -n. Oct 19, 2013 · Sed : replace words only with first occurrence of string in the line not till last match. Sep 23, 2024 · Here $ indicates the last line in the file. Oct 15, 2014 · If the comma might not be on the second-to-last line Using awk and tac: tac foo. Use the rex command for search-time field extraction or string replacement and character substitution. In the middle of this, I saw myself having trouble with the following sed command to limit the result to a single line. 8. sed -i s#expr1#expr2# So, it could be: Aug 28, 2013 · sed print from last occurrence match until the end of last occurrence match Hi, i have file file. txt Use $ to match the end of the line: FILE=`echo ${FILE} | sed 's/. txt $ cat fixedBaeldungScripts. an example might be helpful to make it clear: say, you have a problem: you have a string "120+20foobar" now you want to get the calculation result of 120+20 part, and replace "oo" to "xx" in "foobar" part. 10. ls | sed -e 's/r[0-9]/rA/' It provides me with the following output: rA rA0 rA1 rA rA9 Appreciate if someone can point out what i am missing in the sed search pattern, can sed be used to match multiple digit numbers at all? thank you. g. Seems like you would need to write a script and iterate through the file twice. txt player1 player2 player3 player4 player5 player6 player7 player8. txt Jan 20, 2013 · The following sed command replaces the OLD string with the NEW string. 11' and not '192. I use arch linux and GNU sed version 4. Now reverse the output in reverse line number order, and then remove the line numbers ( we don't need them ) I have the following data. sh hackWifi. sed -e '/ XE/ s/1$/2//' myfile. txt ninjaCats. , false in a Boolean context). *[^0-9]\([0-9]\+\)[^0-9]*$/\1/' It is easier to think this backwards: From the end of the string, match zero or more non-digit characters; Match (and capture) one or more digit characters; Match at least one non-digit character; Match all the characters to the start of the string That is, unlike the ed command, which cannot match a new-line character in the middle of a line, the sed command can match a new-line character in the pattern space. 1-SNASHOT. Jun 29, 2013 · The first command gives a single line aaa. xml Sep 9, 2010 · You can try: sed s'/. ) in the file to yield something like this: 95 flour 47 water etc. A collection based mostly on stackexchange posts along with a few I threw together myself. But unable to print the last line. txt. e. txt > fixedBaeldungScripts. The result should be abc dog Jan 30, 2010 · I have been through the sed one liners but am still having trouble with my goal. Dec 27, 2023 · And we‘re done! In this extensive guide, we went through numerous examples to master replacing only the last matching text with sed. 720000 Jun 30, 2024 · Since tac shows the file’s contents with the last line first and the first line last, we use sed to remove the last occurrence of the pattern in the first line containing it. txt You have over complicated your reg-ex. Feb 22, 2018 · If your sed lacks support, you have to redirect the output to a file sed "COMMANDS" INFILE > TMPFILE; mv TMPFILE INFILE. Have a boolean flag to indicate whether you find the "opening" tag, an int to indicate the line number for the desired text, and then if you find a "closing" tag before another opening tag, you'll store the line number. COLOPHON top This page is part of the sed (stream-oriented editor) project. $. So it will delete 2 lines after finding any of the matches, how can I achieve this ? Dec 28, 2013 · I've tested your sed command but the result is strange (and obviously wrong), and you didn't give any explanation. 4 So far, I have the Update: Starting with macOS Big Sur (11.