Hi,

when I put this line in a script say a.pl:

#!/usr/bin/perl -wl
....

And later I run it from the command line:
perl a.pl

so, does this make perl ignore the "wl" switch in the script?

Thanks.

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On 11-02-22 09:57 AM, terry peng wrote:
> Hi,
>
> when I put this line in a script say a.pl:
>
> #!/usr/bin/perl -wl
> ...
>
> And later I run it from the command line:
> perl a.pl
>
> so, does this make perl ignore the "wl" switch in the script?
>
> Thanks.
>

No, perl reads the shebang line and sets the options.


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On 22 February 2011 17:19, Shawn H Corey <shawnhcorey [at] gmail.com> wrote:
>> when I put this line in a script say a.pl:
>> #!/usr/bin/perl -wl
>> so, does this make perl ignore the "wl" switch in the script?
>
> No, perl reads the shebang line and sets the options.

perl doesn't do any such thing. In a *nix shell environment, when the
file is being executed without calling the perl interpreter, the shell
interprets the line and execute it. If the script is run with "perl
foo.pl" then the shebang is ignored, as the perl interpreter ignores
it as a comment. I believe a Windows environment also ignores it.

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spoke too soon. seems that under both linux and windows perl does read
the shebang line. please ignore previous comment

On 7 March 2011 10:24, Erez Schatz <moonbuzz [at] gmail.com> wrote:
> On 22 February 2011 17:19, Shawn H Corey <shawnhcorey [at] gmail.com> wrote:
>>> when I put this line in a script say a.pl:
>>> #!/usr/bin/perl -wl
>>> so, does this make perl ignore the "wl" switch in the script?
>>
>> No, perl reads the shebang line and sets the options.
>
> perl doesn't do any such thing. In a *nix shell environment, when the
> file is being executed without calling the perl interpreter, the shell
> interprets the line and execute it. If the script is run with "perl
> foo.pl" then the shebang is ignored, as the perl interpreter ignores
> it as a comment. I believe a Windows environment also ignores it.
>
> --
> Erez
>
> La perfection soit atteinte non quand il n'ya plus rien =E0 ajouter,
> mais quand il n'ya plus rien =E0 retrancher.
>



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mais quand il n'ya plus rien =E0 retrancher.

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