Use of $! to find out why an action failed
Advanced File and Directory Handling example from a Well House Consultants training course
More on Advanced File and Directory Handling [link]
Source code: nf Module: P602
print "Log file name: ";
chop ($fn = <STDIN>);
open (FH,">>$fn") or die "failed to open $fn; reason: $!\n";
print "open suceeded\n";
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