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Re: File Test operators, option -T

by zork42 (Monk)
on Sep 12, 2013 at 02:53 UTC ( #1053642=note: print w/ replies, xml ) Need Help??

in reply to File Test operators, option -T

Do you have the following near the start of your script?

use strict; # essential use warnings; # essential use autodie; # optional use diagnostics; # optional
The 2 "essentials" catch lots of errors and will save you lots of time. You should always use them!
If you'd had them in your script you'd have got this error message:

-T on closed filehandle $fh at line 2.

The 2 "optionals" can be very useful.
eg use autodie; would have given you this error message:

Can't open 'input2.txt' for reading: 'No such file or directory' at line 1

  • strict - Perl pragma to restrict unsafe constructs
  • warnings - Perl pragma to control optional warnings
  • autodie - Replace functions with ones that succeed or die with lexical scope
  • diagnostics - produce verbose warning diagnostics

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