Beefy Boxes and Bandwidth Generously Provided by pair Networks
"be consistent"
 
PerlMonks  

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


Comment on Re: opened file being overwritten
Download Code
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

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1008740]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others browsing the Monastery: (18)
As of 2014-12-22 21:24 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    Is guessing a good strategy for surviving in the IT business?





    Results (130 votes), past polls