The time hog is lsof, which takes about 13 seconds to run. ... I understand grep will return 0 if it finds something.

Note that it's possible to get lsof to only look in one directory tree with its +D option, although the manpage does note that it can consume a fair amount of memory, so you might want to keep an eye on that in testing.

As for running external programs from Perl, I've written about that a fair amount, e.g. here - in this case, it seems like capturex from IPC::System::Simple might be a good replacement for qx// (backticks) - if the processes you're running are expected to return either 0 or 1 and that's not an error, then you can specify [0,1] as the first argument.

In reply to Re^4: Easy way to check if a file is open needed. by haukex
in thread Easy way to check if a file is open needed. by Apt_Addiction

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