the ps utility and cron

Andy Farkas andyf at
Tue Apr 22 14:00:59 PDT 2003

On Tue, 22 Apr 2003, Sergey Zaikov wrote:

> I have a question about a key -x from man ps(1).
> The reason of my question may be: misunderstanding man ps(1), errata at man
> ps(1) or error in ps utility.
> (My FreeBSD version:
> FreeBSD 4.7-RELEASE FreeBSD 4.7-RELEASE #38: Thu Mar 20
> 09:31:30 MSK 2003     acc107_3 at  i386)
> Man ps (1) says:
> [*SKIP*]
>  -x      Display information about processes without controlling termi-
>          nals.
> [*SKIP*]
> A processes, started from cron, is processes without controlling terminals. (Or
> I samething don't understand:)
> So:
> $> ps -ax -U acc107_3
> must diplays it and
> $>ps -a -U acc107_3
> should don't displays this processes.

The -U flag forces the -x flag. This is not documented in the manpage.

See /usr/src/bin/ps/ps.c for details.


 :{ andyf at

        Andy Farkas
    System Administrator
   Speednet Communications

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