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Re: How can i check my script is already running?

by hotpelmen (Scribe)
on May 11, 2010 at 16:30 UTC ( [id://839473]=note: print w/replies, xml ) Need Help??


in reply to How can i check my script is already running?

Just a note: you need to exclude your "ps" check from the list of processes returned since it will also match your script path. Try this: 
my @np = `ps aux | grep "/home/shekar/myscript.pl" | grep -v grep`;

print "Number of running processes: " . (scalar @np) . "\n";

[download]
or 
my $np = 
   `ps aux | grep "/home/shekar/myscript.pl" | grep -v grep | wc -l`;
chomp $np;
print "Number of running processes: $np\n";

[download]
But I agree with others, you can find better ways to do it.

Replies are listed 'Best First'.
Re^2: How can i check my script is already running?
by Hue-Bond (Priest) on May 11, 2010 at 16:41 UTC
    Just a note: you need to exclude your "ps" check from the list of processes returned since it will also match your script path.

    I like to use the following trick, so as not to invoke an additional grep:

    $ ps aux | grep [i]nit
root         1  0.0  0.0  23820  2024 ?        Ss   08:23   0:01 /sbin
+/init

    [download]

    --
     David Serrano
     (Please treat my english text just like Perl code, i.e. feel free to notify me of any syntax, grammar, style and/or spelling errors. Thank you!).

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