Difference between revisions of "Awk"

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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 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]

Revision as of 16:06, 26 March 2010

awk is a command for string operations. For example, it allows you to show only the second column of a file. awk is not a simple command, but rather a programming language on its own. 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 }'

See also