1. The psmisc package contains utilities for managing processes on your system: pstree, killall and fuser. The pstree command displays a tree structure of all of the running processes on your system. The killall command sends a specified signal (SIGTERM if nothing is specified) to processes identified by name. The fuser command identifies the PIDs of processes that are using specified files or filesystems. From Mandrake 9.0 RPM

2. Utilities that use the proc filesystem This package contains three little utilities that use the proc FS: `fuser' identifies processes using files (similar to Sun's or SGI's fuser). `killall' kills processes by name, e.g. killall -HUP named. `pstree' shows the currently running processes as a tree From Debian 3.0r0 APT