44 lines
826 B
Plaintext
44 lines
826 B
Plaintext
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#!/usr/bin/perl
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use 5.10.0;
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use strict;
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use warnings;
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# onetime - Only run a command if it's not already running.
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#
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# Usage: onetime <command>
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# Ex: onetime xchat
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#
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# --Kirsle
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# http://sh.kirsle.net
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if (scalar(@ARGV) == 0 || (scalar(@ARGV) && $ARGV[0] =~ /^-+h/)) {
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say "Usage: onetime <command>";
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say " Ex: onetime xchat";
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exit(1);
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}
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my ($cmd,@args) = @ARGV;
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if ($cmd =~ /[^A-Za-z0-9-_]/) {
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die "That command looks funny :\\ '$cmd'";
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}
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# See if it's already running.
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my @ps = `ps aux | grep $cmd`;
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my $found = 0;
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foreach my $line (@ps) {
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my ($user, $pid, @extra) = split(/\s+/, $line, 11);
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my $cmdline = pop(@extra);
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next if $cmdline =~ /grep/;
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next if $cmdline =~ /\Q$0\E/;
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$found = $pid;
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last;
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}
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if ($found) {
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say "'$cmd' appears to already be running as PID $found.";
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exit(1);
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}
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exec($cmd, @args);
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