opensourcetutor.com » awk http://www.opensourcetutor.com On Linux, Web Development, Joomla and Magento commerce Fri, 20 Aug 2010 06:42:54 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 Bash command to determine multiple logins sorted by user with the most logins http://www.opensourcetutor.com/2008/05/29/bash-command-to-determine-multiple-logins-sorted-by-user-with-the-most-logins/ http://www.opensourcetutor.com/2008/05/29/bash-command-to-determine-multiple-logins-sorted-by-user-with-the-most-logins/#comments Thu, 29 May 2008 01:41:09 +0000 salubrium http://www.opensourcetutor.com/2008/05/29/bash-command-to-determine-multiple-logins-sorted-by-user-with-the-most-logins/
Here ’tis

w | awk ‘{a[$1]++}END{for(i in a){print a[i] ” ” i}}’ | sort -rn | head

stumbled on this issue with a HP-UX server we run where the maxusers kernel paramater is set to 600 (512 by default). To change this setting, requires a reboot of the server (something not easily achievable at midday with 600 users logged in). You can change kernel parameters via SAM in HP-UX

This is a slight modification of the 1 liner that sorts your bash history by commands used:

history | awk ‘{a[$2]++}END{for(i in a){print a[i] ” ” i}}’ | sort -rn | head

Here’s some examples of my own from 2 machines:

235 ll
163 cd
149 grep
37 vi
32 for
31 du
26 rm
23 tail
21 htop
20 /etc/init.d/httpd

Here’s my home machine (I use pkill when I login to the same user desktop remotely via NX to kill evolution in the console session) :

109 ll
42 sudo
35 locate
35 cd
24 pkill
17 more
15 vi
15 unison
15 ssh
14 echo

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