#!/vol/perl/perl5.004_04/bin/perl -w -- # -*-Perl-*-
#
# murder
#
# murder just takes one arguement.  It finds any processes with that
# string in them, and kills them.
#
use strict; # always
use Getopt::Long;

my($ps) = '/usr/bin/ps';
my($sleep) = 1;
#$sleep = 3 if ($username eq 'merlyn');  # ;-)

my($usage) = "Usage: murder [options] [command string]
  -all   Murder regardless of user id (need to be root)
  -force Don't prompt me, just kill 'em
  -nop   Only show, don't actually kill
  -help  Display this help and exit
";

# parse options
use vars qw/$nop $all_users $force/;
GetOptions("nop"   => \$nop,
	   "all"   => \$all_users,
	   "force" => \$force,
	   "help"  => sub { die "$usage\n"; },
	   ) or die "$usage\n";

my($username) = getlogin || (getpwuid($<))[0] || die "Failed to obtain username!";

# exit if no arguements
die "$usage\n" unless (@ARGV);

# Get list of processes
my(%pids);
foreach (`$ps -e -o "pid user args"`) {
    my($searchstring) = join ' ',@ARGV;
    if (/^(\d+)\s+(\S+)\s+(.*$searchstring.*)$/) {
	next if ((! $all_users) && ($2 ne $username));
	($pids{$1}{user},$pids{$1}{args}) = ($2,$3) unless /murder/;
    }
}
die "No processes found\n" unless (%pids);

# We're killing stuff, so it's a good idea to have an "are you sure" prompt
unless ($force) {
    foreach (keys %pids) {
	printf "%6u %-8s %s\n",$_,$pids{$_}{user},$pids{$_}{args};
    }
    print "Are you sure you want to kill these processes (y/n)? [n]:";
    chomp(my $answer = <STDIN>);
    die "Abort!\n" unless ($answer =~ /^y$/i);
}

# Kill 'em off
foreach my $pid (keys %pids) {
    foreach my $signal (qw/2 1 15 9/) {
	printf "Kill -$signal $pid ($pids{$pid}{user}:$pids{$pid}{args})\n";
	unless ($nop) { 
	    kill $signal => $pid;
	    sleep $sleep;
	    last unless (kill 0 => $pid);
	}
    }
}