Difference between revisions of "Awk"
From Linuxintro
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| − | [[awk]] is a [[command]] for string operations. For example, it allows you to show only the second ''column'' of a file | + | [[awk]] is a [[command]] for string operations. For example, it allows you to show only the second ''column'' of a file. awk and gawk (for GNU awk) are used synonymously. |
;Examples: | ;Examples: | ||
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kill all processes of a user | kill all processes of a user | ||
[[ps]] --no-header -fu <username> | [[awk]] '{ print $2 }' | [[grep]] -v $$ | [[xargs]] kill | [[ps]] --no-header -fu <username> | [[awk]] '{ print $2 }' | [[grep]] -v $$ | [[xargs]] kill | ||
| − | extract eth0's MAC address from ifconfig output | + | extract ''eth0'''s MAC address from ifconfig output |
| − | ifconfig | grep eth0 | awk '{ print $5 }' | + | ifconfig | grep ''eth0'' | awk '{ print $5 }' |
= See also = | = See also = | ||
* [http://man-wiki.net/index.php/Awk gawk man page] | * [http://man-wiki.net/index.php/Awk gawk man page] | ||
| + | * [[piping]] | ||
* [[Shell Scripting Tutorial]] | * [[Shell Scripting Tutorial]] | ||
Revision as of 07:02, 27 September 2013
awk is a command for string operations. For example, it allows you to show only the second column of a file. awk and gawk (for GNU awk) are used synonymously.
- Examples
Show only the second column of file.txt
awk '{print $2;}' file.txt
kill all processes of a user
ps --no-header -fu <username> | awk '{ print $2 }' | grep -v $$ | xargs kill
extract eth0's MAC address from ifconfig output
ifconfig | grep eth0 | awk '{ print $5 }'
