Re: [PLUG] check for existing user

[Tim Peeler <kpeeler@erols.com>]

On Sun, 16 Jan 2000, you wrote:
> > > I was thinking of just using the command id, but for either grep or id,
> > > how do I make a variable equal to true or false depending on what grep or
> > > another command returns? (in bash)
> > 
> > Just use an if statement.
> > 
> > if (grep regexp foo 1>&2 > /dev/null) ; then
> 
> Rather than redirecting stderr and stdout to /dev/null, you could grep's
> --silent or -q option, which suppresses normal matching output.  It also
       ^^^^^                             ^^^^^^^^^^^                       ^^^^^^
> optimizes things a bit, by exiting after finding the first match.
> 
> Additionally, you don't need to enclose the if condition in parentheses
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> with the Bourne shell.  (Doing so just causes your shell to fork an
  ^^^^^^^^^^^^^^^^^^^^
> additional time).
> 
> -mct

Hey, cool.  I learn something new every day :-)

______________________________________________________________________
Philadelphia Linux Users Group       -       http://plug.nothinbut.net
Announcements - http://lists.nothinbut.net/mail/listinfo/plug-announce
General Discussion   -   http://lists.nothinbut.net/mail/listinfo/plug