The Hidden PS

for p in `ps L|cut -d' ' -f1`;do echo -e "`tput clear;read -p$p -n1 p`";ps wwo pid:6,user:8,comm:10,$p kpid -A;done
While going through the source code for the well known ps command, I read about some interesting things.. Namely, that there are a bunch of different fields that ps can try and enumerate for you. These are fields I was not able to find in the man pages, documentation, only in the source. Here is a longer function that goes through each of the formats recognized by the ps on your machine, executes it, and then prompts you whether you would like to add it or not. Adding it simply adds it to an array that is then printed when you ctrl-c or at the end of the function run. This lets you save your favorite ones and then see the command to put in your .bash_profile like mine at : http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html Note that I had to do the exec method below in order to pause with read. t () { local r l a P f=/tmp/ps c='command ps wwo pid:6,user:8,vsize:8,comm:20' IFS=' '; trap 'exec 66 exec 66 $f && command ps L | tr -s ' ' >&$f; while read -u66 l >&/dev/null; do a=${l/% */}; $c,$a k -${a//%/} -A; yn "Add $a" && P[$SECONDS]=$a; done }
Sample Output
   PID USER     COMMAND    TPGID
     1 root     init          -1
  1661 avahi    avahi-daem    -1
  1662 avahi    avahi-daem    -1
  2037 root     screen      2037
  3804 postfix  pickup        -1
  3906 nobody   httpd         -1
  3907 nobody   httpd         -1
  3910 nobody   httpd         -1
  5395 root     bash       12055
  5638 nobody   httpd         -1

What Others Think

fantastic, thanx.
oernii3 · 422 weeks and 2 days ago

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Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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