Perhaps for VMS and suchlike, I don't know. On AS build 630 (perl 5.6.1)/Windows95, which does not support flock, my code gives: 

C:\download>perl -c flock.pl
flock.pl syntax OK
C:\download>perl flock.pl
flock not supported! flock() unimplemented at flock.pl line

[download]
at which point winders wrote off the edge of the screen and lost the line number ;-)

My 'fatal error' jargon came directly from 'perldoc -f flock'.

After Compline,
Zaxo

In reply to Re: •Re: Re: use flock() to determine if other script is running by Zaxo
in thread use flock() to determine if other script is running by Red_Dragon

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