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hello
I am using strawberry perl.
Very first line i encountered to write while coding is "#! /user/bin/perl
-w". It is where interpreter exists. What does this mean. Is this path is
same always.perl is installed in c drive but i am writing programs in other
drive. Is it still same.
please help me.
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Hello Anant,
#!/usr/bin/perl is a *shebang* and is useful only in unix-like systems where
it refers to the location of the interpreter. Under other systems the
interpreter ignores this line as a comment. Shebang lines are useful to
execute a script directly without having to specify the interpreter.
Consider a script named main.pl which can be executed under unix-like systems
as:
perl main.pl
or
../main.pl # system checks the shebang line for the interpreter to use
For more information: http://en.wikipedia.org/wiki/Shebang_(Unix)
Regards,
Alan Haggai Alavi.
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The difference makes the difference.
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On Mon, 18 Jul 2011 07:34:14 +0200, anant mittal
rote:
> -w
Just a quick note: Please do not use -w in the hashbang, it forces warnin=
gs everywhere, even when modules didn't want warnings. You'll get weird e=
rror messages if you leave that in. Instead just write "use warnings;" at=
the top of your code and you'll be fine. :)
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With regards,
Christian Walde
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On Mon, 18 Jul 2011 10:19:00 +0200, Chankey Pathak
wrote:
> @Christian wale: Why not to use -w for using warning everywhere?
>
> It's good to use warnings everywhere for a good program, isn't it?
Simply put:
It activates warnings for code you did not write.
It is an extremely good idea to enable warnings for all code you write yo=
urself. However if you enable it for code written by authors who did not =
want warnings, or for old modules, then you will get pointless messages y=
ou cannot fix.
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With regards,
Christian Walde
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