Awk
From Linuxintro
Revision as of 07:09, 27 September 2013 by 95.113.201.142 (talk)
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 username
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 }'
- sorted list of memory consumption by applications
# ps aux|awk '{print $6" " $11;s=s+$6} END {print s}' | sort -n
The output will look like this:
[...] 4028 dovecot/auth 4528 /sbin/haveged 8348 /usr/sbin/httpd2-prefork 38764 /usr/sbin/httpd2-prefork 43628 /usr/sbin/httpd2-prefork 279148
