[NMLUG] grep help

[pi at pihost.us (Anthony Martinez)]

On Wed, Mar 16, 2005 at 06:16:05PM -0700, Ed Heron 
carved this out of pure phosphors:
> From: "Pi" <pi@pihost.us>
> Sent: Wednesday, March 16, 2005 4:47 PM
> 
> 
> >id -Gn <user> | grep 'groupname'

Either that, or review the programmatic features of getpwent or getgrent.
getgrent might be useful.

Try something like this in perl
#!/usr/bin/perl -w
%mapping = ();
$groupname = $ARGV[0] or die;
$username = $ARGV[1] or die;
(undef, undef, undef, $members) = getgrnam($groupname);
foreach $user(split(' ', $members))
{
    $mapping{$user} = 1;
}
print "$username in $groupname!\n" if $mapping{$username};


It initialises an empty mapping hash, sets the two variables off of the command
line, gets a list of the memebrs using the getgrnam function, maps the list of
users in that group into the hash, and then performs the test. This way, it
requires an exact match :)

Apologies if the code above is too dense, I wrote it in like 5 mintues. If you
want me to better explain, please say so :)



> 
>  Hmm.  That's interesting.  Hadn't seen that command.  That might be better 
> for what I'm doing. 
> 
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