[Israel.pm] losing my sanity?

[Levenglick Dov-RM07994]

You live and learn. Thank you

 
Best Regards,
Dov Levenglick
SmartDSP OS Development Leader
From: perl-bounces at perl.org.il [mailto:perl-bounces at perl.org.il] On Behalf Of sawyer x
Sent: Thursday, September 08, 2011 11:22
To: Perl in Israel
Subject: Re: [Israel.pm] losing my sanity?

On Thu, Sep 8, 2011 at 11:15 AM, Gabor Szabo <szabgab at gmail.com> wrote:
order of switches? 

try

perl -MCwd -e "print Cwd::getcwd();"

Indeed that is the problem.

-e expects the next string to be something to run. When you write "-e -MCwd", you're actually asking the perl interpreter to run the Perl code "-MCwd", which results in.. nothing. "-" is used for negation, and that line of "code" is basically negating "MCwd".

If you were to add strictures, you would get a warning.

$ perl -Mstrict -W -e -MCwd
Useless use of negation (-) in void context at -e line 1.

The reason this gets you a warning is because you're not doing anything with the value you got from the operation. If you were to use it, the warning would cease.

$ perl -Mstrict -W -e "print -MCwd"
-MCwd

The value of negating MCwd is .. -MCwd. :)