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RE: ps -p <pid>
- From: Igor Pechtchanski <pechtcha at cs dot nyu dot edu>
- To: Don Beusee <dbeusee at yahoo dot com>
- Cc: cygwin at cygwin dot com
- Date: Wed, 27 Jul 2005 22:02:25 -0400 (EDT)
- Subject: RE: ps -p <pid>
- References: <20050728005142.97092.qmail@web31405.mail.mud.yahoo.com>
- Reply-to: cygwin at cygwin dot com
Ugh, top-posting. Reformatted.
On Wed, 27 Jul 2005, Don Beusee wrote:
> > -----Original Message-----
> > From: Carlo Florendo [mailto:list-subscriber@XX.XXXXX.XX]
> > Sent: Wednesday, July 27, 2005 5:22 PM
> > To: Don Beusee
> > Cc: cygwin@XXXXXX.XXX
<http://cygwin.com/acronyms/#PCYMTNQREAIYR>. Thanks.
> > Don Beusee wrote:
> >
> > >Can you add the -p <pid> option? All flavors of Unix these days
> > >allows you to specify which PID to ps.
> >
> > ps | grep <pid>
>
> That's not good enough for scripting. First of all, the command is not
> so simple (you have to grep -v grep also - so that the same script works
> on Unix systems) and if you have small PID number like 14, that will
> likely return lots of other processes (like 114, etc). Also, the same
> <PID> appears in the PPID column if it has children. Some Unix variants
> might not have a space in the ps output between the PID and previous or
> next column when one of the column's data is larger than the specified
> printf format.
>
> So your command is not reliable enough for scripting and is also very
> slow on large Unix systems with 1000's of processes running. ps -p
> <PID> is immediate, reliable, and portable (it's SYSV/SVR4 standard).
procps -p <PID>
HTH,
Igor
--
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