I am learning Perl , very new user . May i know whats the difference between these Perl codes.
#!/usr/bin/perl
&
#!/usr/bin/perl -w
I am learning Perl , very new user . May i know whats the
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I am learning Perl , very new user . May i know whats the difference between these Perl codes.
#!/usr/bin/perl
&
#!/usr/bin/perl -w
That is not perl code, it’s a shebang, which is used in a linux/unix environment as a way to tell the shell what program should be used to run the program file. It has no effect in windows, but it does activate any switches used.
The
-wpart is a switch for perl, telling it to activate warnings. You can learn more about perl’s command line switches by typingperl -hat the command prompt. Read more inperldoc perlrun-wis the older version of theuse warningspragma, which is preferred nowadays. While-wis global,use warningsis lexical, and can be activated selectively.