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Full Discussion: Perl failure with "main::$fn" used only once:" in error logs
Top Forums Shell Programming and Scripting Perl failure with "main::$fn" used only once:" in error logs Post 302776695 by DGPickett on Wednesday 6th of March 2013 04:50:04 PM
Old 03-06-2013
Beginners Intro to Perl - Part 6 - Perl.com says:

1. Name ``main::filename'' used only once: possible typo at ./a6-warn.pl line 3. and Name ``main::fn'' used only once: possible typo at ./a6-warn.pl line 4. Perl notices that $filename and $fn both only get used once, and guesses that you've misspelled or misnamed one or the other. This is because this almost always happens because of typos or bugs in your code, like using $filenmae instead of $filename, or using $filename throughout your program except for one place where you use $fn (like in this program).

You can run CGI on the command line, just set the variables it reads.
 

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LEARN ABOUT OSX

perlfreebsd

PERLFREEBSD(1)						 Perl Programmers Reference Guide					    PERLFREEBSD(1)

NAME

       perlfreebsd - Perl version 5 on FreeBSD systems

DESCRIPTION

       This document describes various features of FreeBSD that will affect how Perl version 5 (hereafter just Perl) is compiled and/or runs.

   FreeBSD core dumps from readdir_r with ithreads
       When perl is configured to use ithreads, it will use re-entrant library calls in preference to non-re-entrant versions.	There is a bug in
       FreeBSD's "readdir_r" function in versions 4.5 and earlier that can cause a SEGV when reading large directories. A patch for FreeBSD libc
       is available (see http://www.freebsd.org/cgi/query-pr.cgi?pr=misc/30631 ) which has been integrated into FreeBSD 4.6.

   $^X doesn't always contain a full path in FreeBSD
       perl sets $^X where possible to a full path by asking the operating system. On FreeBSD the full path of the perl interpreter is found by
       using "sysctl" with "KERN_PROC_PATHNAME" if that is supported, else by reading the symlink /proc/curproc/file. FreeBSD 7 and earlier has a
       bug where either approach sometimes returns an incorrect value (see http://www.freebsd.org/cgi/query-pr.cgi?pr=35703 ).	In these cases
       perl will fall back to the old behaviour of using C's argv[0] value for $^X.

AUTHOR

       Nicholas Clark <nick@ccl4.org>, collating wisdom supplied by Slaven Rezic and Tim Bunce.

       Please report any errors, updates, or suggestions to perlbug@perl.org.

perl v5.16.2							    2012-10-11							    PERLFREEBSD(1)
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