Garance A Drosehn 4e8b6a6fb0 Improvements to 'ps -p <x>'. If <x> is a process id that does not exist, then
just print the header (if any) and exit, thus matching the behavior on -stable
and other OS's.

Also adds support for <x> being a comma-separated list of processes, and does
a much better checking for invalid-values of <x>, such as 'ps -p someword'.

Reviewed by:	mentioned on freebsd-current
MFC after:	10 days
2004-03-17 22:46:58 +00:00
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