Like many other users of Windows, my computer crashes frequently. I've gotten to the point where I don't really mind it all that much, but I spend a great deal of time logged into my account at school from my home computer, and when my comp crashes, I remain logged in. I know after a while these logins will (hopefully) be killed off, but I'm impatient. So I harnessed the power of Perl to find a way to kill these clones so that I don't appear to have 14 terminals open at a time. My code follows:

#!/usr/bin/perl -w
use strict;
my $prog = (split "\/", $0)[-1];

die "Usage: $prog\n" if @ARGV;
my $user = getpwuid $<;
my @results = `ps -ef`;
chomp @results;
shift @results; # remove header

my @listing;
for (@results) {
   if (m|^([\w\d]+) \s+
          (\d+) \s+
          (\d+) \s+
          (\d+) \s+
          ([\w\d:]+) \s+
          ([\w\d/?]+) \s+
          ([\w\d:]+) \s+
          (.*)$|x) {
      my $hashref = {};
      $$hashref{'uid'} = $1;
      $$hashref{'pid'} = $2;
      $$hashref{'ppid'} = $3;
      $$hashref{'c'} = $4;
      $$hashref{'stime'} = $5;
      $$hashref{'tty'} = $6;
      $$hashref{'time'} = $7;
      $$hashref{'cmd'} = $8;
      push @listing, $hashref;
   }
   else {
      warn "$prog: Could not process line! Line follows:\n$_\n";
      next
   }
}

# My thinking: when run from the shell, this process' ppid will be the
# pid of my shell. Problem is, what happens when it's not run from the
# shell (say, run through vi's ":!killclone")?
my $ppid = (grep {$$_{'pid'} eq $$} @listing)[0]->{'ppid'};

@listing = grep {$$_{'uid'} eq $user} @listing;  # Just mine
@listing = grep {$$_{'cmd'} =~ /^-/} @listing;   # Just login shells
@listing = grep {$$_{'pid'} ne $ppid} @listing;  # Not this shell

for (@listing) { kill 9, $$_{'pid'} }

[download]

It seems to be working fine, but there is the problem I note in the comments above "my $ppid". I'd like to know how to solve that, as well as any of your suggestions on other things I should have done, or places my logic is just shot. Also, I know that the dot-star in the regex isn't looked upon all that highly here at PM, but I think that it's the right tool for this, as I really do want everything to the end of the line... I think. :) Anyway, thanks in advance for your help.

Note: While I appreciate the awesomeness of CPAN, CPAN modules would be a less-than-ideal solution, as I don't have access to do a real install, and I don't have all that much room on this account. But, if it would significantly improve things, I'm always open to clearing space for a module.

His Royal Cheeziness

In reply to Killing clones for fun and profit by CheeseLord

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