For installation instructions see Section 6.53.
Psmisc (21.3):
http://download.sourceforge.net/psmisc/
ftp://download.sourceforge.net/pub/sourceforge/psmisc/
The Psmisc package contains three programs which help manage the /proc directory.
Installed programs: fuser, killall and pstree
fuser reports the PIDs of processes that use the given files or filesystems.
killall kills processes by name. It sends a signal to all processes running any of the given commands.
pidof reports the PIDs of the given programs. (Not this pidof program is used, however, but the one from Sysvinit.)
pstree displays running processes as a tree.