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Re: opened file being overwritten

by GrandFather (Cardinal)
on Dec 13, 2012 at 22:44 UTC ( #1008740=note: print w/ replies, xml ) Need Help??


in reply to opened file being overwritten

This is a good time to start always using the three parameter version of open and lexical file handles:

open my $file4In, '<', $fileName or die "Could not open $filename: $!\ +n";

Appending In or Out to your file handles helps as a sanity and consistency check.

You get even more linty goodness if you always use strictures (use strict; use warnings;).

Note too that showing why an open failed often is at least as useful as showing which open failed.

True laziness is hard work


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Re^2: opened file being overwritten
by davido (Archbishop) on Dec 13, 2012 at 23:01 UTC

    I might add that while it's uncommon to see it done here, checking the return value of print can be useful. Consider this:

    perl -e 'print BADHANDLE "Hello world.\n" or die $!'

    ...output...

    Bad file descriptor at -e line 1.

    ...which is kinda nice information to know.


    Dave

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