Perl "Shebang"

Can anyone tell me what the "--" means in this line:

#!/usr/bin/perl --

This is part of a forum script (YaBB). I haven't see just -- before

Bill H

Re: Perl "Shebang"

Bill H wrote in news:1194353969.307648.288080
@o80g2000hse.googlegroups.com:

> Can anyone tell me what the "--" means in this line:
>
> #!/usr/bin/perl --
>
> This is part of a forum script (YaBB). I haven't see just -- before

C:\Temp> perl -h

Usage: C:\opt\Perl\bin\perl.exe [switches] [--] [programfile] [arguments]

Clearly, it marks the end of command line switches.

My guess is, YaBB authors used it to protect against accidental binary FTP
transfers between Windows and Unix EOL based systems mucking up the shebang
line.

Sinan


--
A. Sinan Unur <1usa@llenroc.ude.invalid>
(remove .invalid and reverse each component for email address)
clpmisc guidelines:

Re: Perl "Shebang"

Bill H wrote:
> Can anyone tell me what the "--" means in this line:
>=20
> #!/usr/bin/perl --
>=20
> This is part of a forum script (YaBB). I haven't see just -- before

Usually '--' on a command line means that anything after that will *not* =

be considered an option, even if it begins with '-'.

I don't know YaBB and how it calls the script, but I guess that the=20
script might be called with additional parameters which may be provided=20
by the user, and this construct prevents the unwanted interpretation of=20
a leading '-' in the first argument.

--=20
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Re: Perl "Shebang"

Bill H wrote:
>
> Can anyone tell me what the "--" means in this line:
>
> #!/usr/bin/perl --
>
> This is part of a forum script (YaBB). I haven't see just -- before

On the command line it means that there are no more program switches
(options) to the right of --, everything following -- is data only.

In a program like that it is used as a guard against extraneous
whitespace confusing the operating system. For example, if you edit the
script in Windows and then try to run it in *nix.


John
--
use Perl;
program
fulfillment