procps is a set of command line and full-screen utilities that provide information out of the pseudo-filesystem most commonly located at /proc.
The following programs are found in procps:
free
free -m
free -mt
free -gt
kill, pkill, pgrep, pmap, ps, pwdx, skill, slabtop, snice, sysctl, tload, uptime, vmstat, w, and watch.