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From: lwall@jpl-devvax.JPL.NASA.GOV (Larry Wall)
Newsgroups: comp.lang.perl
Subject: Re: an example please
Message-ID: <10274@jpl-devvax.JPL.NASA.GOV>
Date: 7 Nov 90 21:50:38 GMT
References: <9013.2737e4c1@ohstpy.mps.ohio-state.edu>
Reply-To: lwall@jpl-devvax.JPL.NASA.GOV (Larry Wall)
Organization: Jet Propulsion Laboratory, Pasadena, CA
Lines: 21

In article <9013.2737e4c1@ohstpy.mps.ohio-state.edu> parker@ohstpy.mps.ohio-state.edu writes:
: Could someone send me a perl script that reads /etc/utmp file
: under SusOS 4.1 as an example.

Here's a who clone:

#!/usr/bin/perl
# This assumes your /etc/utmp file looks like ours
open(UTMP,'/etc/utmp');
@mo = (Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec);
while (read(UTMP,$utmp,36)) {
    ($line,$name,$host,$time) = unpack('A8A8A16l',$utmp);
    if ($name) {
	$host = "($host)" if $host;
	($sec,$min,$hour,$mday,$mon) = localtime($time);
	printf "%-9s%-8s%s %2d %02d:%02d   %s\n",
	  $name,$line,$mo[$mon],$mday,$hour,$min,$host;
    }
}   

Larry