freebsd-ports/sysutils/pkill/pkg-descr
Mario Sergio Fujikawa Ferreira e97feb9a30 o New port pkill version 0.1: NetBSD's pgrep and pkill: find or
signal processes matching criteria
o Based on current NetBSD's pgrep(1) and pkill(1) with the following
  differences:
	1) -STABLE version does not support filtering by session
	   ID since this information is only available in kernel
	   space. -CURRENT supports this.
	2) Added -M and -N flags following ps(1). Therefore, drop
	   additional privileges (drop_privs) if any of those flags
	   are defined.
	3) kvm access without sgid
o Items (2) and (3) are based on jmallett code sent to me for
  inspiration. :) Great thanks to jmallett for that.

Obtained from:	NetBSD CVS (original pkill/pgrep code)
2002-11-08 13:08:21 +00:00

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[ excerpt from commands' man page ]
Port of NetBSD's pgrep(1) and pkill(1) commands which either find
or signal processes matching criteria.
The pgrep command searches the process table on the running system
and prints the process IDs of all processes that match the criteria
given on the command line.
The pkill command searches the process table on the running system
and signals all processes that match the criteria given on the
command line.