Re: how to exit if tool is already running

Check out the excellent CPAN module Sys::RunAlone, it should help fix this problem. It cleverly locks your scripts DATA handle to prevent another invocation of the same script doing so. It's cross-Unix, but you'd need something fancier on Windows.

HTH,
SSF

Comment on Re: how to exit if tool is already running

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Re^2: how to exit if tool is already running by JavaFan (Canon) on Aug 12, 2010 at 09:18 UTC
Considering flocking the data handle only takes a single line, there isn't much to gain from using a module (the module does more, but the OP doesn't need that). After ending the script with `__DATA__` (or `__END__`), just add: `flock DATA, 6 or die "Duplicate instance";` [download] Or use the `Fnctl` module and use `LOCK_EX\|LOCK_NB` instead of 6.	[reply] [d/l] [select]


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