How to Execute Multiple Sed Commands
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0 Like Home About Free eBook Archives Best of the Blog Contact Unix Sed Tutorial: How To Execute Multiple Sed Commands by Sasikala on October 16, 2009 Tweet 0 Question: Is it possible for me to combine multiple sed commands? Can I combine two sed commands and execute it as single sed command? Answer: In our previous articles we learned sed with single commands — printing , deletion, substitute and file write. In this article let us review how to combine multiple sed commands using option -e as shown below. Syntax: #sed -e 'command' -e 'command' filename Note: -e option is optional for sed with single command. sed will execute the each set of command while processing input from the pattern buffer. Let us first create thegeekstuff.txt file that will be used in all the examples mentioned below. # cat thegeekstuff.txt 1. Linux - Sysadmin, Scripting etc. 2. Databases - Oracle, mySQL etc. 3. Hardware 4. Security (Firewall, Network, Online Security etc) Ads by Google Free Dating Dating Online Dating Websites Dating Site Unix Sed Tutorial: How To Execute Multiple Sed Commands http://www.thegeekstuff.com/2009/10/unix-sed-tutorial-how-to-execute-mu... 1 of 9 1/12/2012 12:17 AM
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Unix Sed Tutorial: How To Execute Multiple Sed
Commands
by Sasikala on October 16, 2009
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Question: Is it possible for me to combine multiple sed commands? Can I combine two sed commands andexecute it as single sed command?
Answer: In our previous articles we learned sed with single commands — printing, deletion, substitute and filewrite.
In this article let us review how to combine multiple sed commands using option -e as shown below.
Syntax:
#sed -e 'command' -e 'command' filename
Note: -e option is optional for sed with single command. sed will execute the each set of command whileprocessing input from the pattern buffer.
Let us first create thegeekstuff.txt file that will be used in all the examples mentioned below.
# cat thegeekstuff.txt
1. Linux - Sysadmin, Scripting etc.
2. Databases - Oracle, mySQL etc.
3. Hardware
4. Security (Firewall, Network, Online Security etc)
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Unix Sed Tutorial: How To Execute Multiple Sed Commands http://www.thegeekstuff.com/2009/10/unix-sed-tutorial-how-to-execute-mu...
1 of 9 1/12/2012 12:17 AM
5. Storage
6. Cool gadgets and websites
7. Productivity (Too many technologies to explore, not much time available)
8. Website Design
9. Software Development
10.Windows- Sysadmin, reboot etc.
1.Delete 4th and 2nd line from the input
This sed example deletes 4th and 2nd line from the file thegeekstuff.txt. Using “-e” option, you can give anynumber of commands with sed.
$ sed -e '4d' -e '2d' thegeekstuff.txt
1. Linux - Sysadmin, Scripting etc.
3. Hardware
5. Storage
6. Cool gadgets and websites
7. Productivity (Too many technologies to explore, not much time available)
8. Website Design
9. Software Development
10.Windows- Sysadmin, reboot etc.
2. Print the lines which matches the pattern1 and lines matches pattern2
This sed example prints all lines that matches either the pattern “Storage” or “Software”.
$ sed -n -e '/Software/p' -e '/Storage/p' thegeekstuff.txt
5. Storage
9. Software Development
3. Delete the first,last and all the blank lines from input
This sed example deletes the first line, last line and all the blank lines from input file.
$ sed -e '1d' -e '$d' -e '/^$/d' thegeekstuff.txt
2. Databases - Oracle, mySQL etc.
3. Hardware
4. Security (Firewall, Network, Online Security etc)
5. Storage
6. Cool gadgets and websites
7. Productivity (Too many technologies to explore, not much time available)
8. Website Design
Unix Sed Tutorial: How To Execute Multiple Sed Commands http://www.thegeekstuff.com/2009/10/unix-sed-tutorial-how-to-execute-mu...
2 of 9 1/12/2012 12:17 AM
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9. Software Development
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Tags: Sed Multicommand, Sed option -e, Sed Tips and Tricks, Unix Sed Command
{ 5 comments… read them below or add one }
1 Guy Patterson October 22, 2009 at 8:43 pm
Unix Sed Tutorial: How To Execute Multiple Sed Commands http://www.thegeekstuff.com/2009/10/unix-sed-tutorial-how-to-execute-mu...
3 of 9 1/12/2012 12:17 AM
There’s also potential to use a semi-colon to combine multiple sed arguments.
For example, I use the following to watch httpd access logs:
RED=`echo -en ‘\e[32m'`YELLOW=`echo -en '\e[93m'`RESET=`echo -en '\e[00m'
sudo tail -f /mnt/netdata/_shares/logs/httpd/domain.com/$YEAR/$MON/domain-access-$MON-$YEAR.log |sed -e "s/ .̂*\]: //g;s/ http://www.domain.*\] \”/ – \”/g;s/ HTTP\/1\.[0-9]\”/\”/g;s/ [0-9][0-9][0-9] [0-9]* \”/ \”/g;s/http:\/\/www.domain.com//g;s/\([0-9]*\.[0-9]*\.[0-9]*\.[0-9]*\)/$RED\1$RESET/g;s/\(\”[^\"]*\”\)/$YELLOW\1$RESET/g;s/*169.254.254.254*//g”
yay cli! :]
2 fety November 12, 2009 at 3:14 am
Hi, Ramesh
I have been following your tutorial from the first tutorial of SED. It is really help me so much tounderstand better about SED.Again, thanks very much.
3 John Alles January 20, 2010 at 9:18 am
Hi,I have a file as 12000 lines like this:a 1 2 3a 2 3 4a 5 6 9…..I would like to change “a” by “x” every 50 lines.
I know this command:sed -e “s///”
I have to 2400 times.Do you know easier way for taht?
4 Sasikala January 20, 2010 at 11:16 pm
To change “a” by “x” in every 50th line of a file, use the following.
$ sed ‘:loop$!Ns/^\(\([ \̂n]*\n\)\{49\}\)a\([ \̂n]*\)/\1x\3/t$!b loop‘ filename
5 frankhuang November 17, 2010 at 1:10 am
The commandsed ’1~50s/a/x/g’ filename.txt >out.txt
Unix Sed Tutorial: How To Execute Multiple Sed Commands http://www.thegeekstuff.com/2009/10/unix-sed-tutorial-how-to-execute-mu...
4 of 9 1/12/2012 12:17 AM
also works
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