Re: 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]

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.

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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!).	[reply] [d/l] [select]

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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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