On Sun, 2004-08-08 at 04:06, JupiterHost.Net wrote:
> I found this code in a script right after the she-bang line:
>
> eval 'exec /usr/bin/perl -T -w -S $0 ${1+"$@"}'
> if 0; # not running under some shell
>
> What is it doing?
Hi.
From `perldoc perlrun`, under -S :
Typically this is used to emulate #! startup on platforms that
don't support #!. This example works on many platforms that have
a shell compatible with Bourne shell:
#!/usr/bin/perl
eval 'exec /usr/bin/perl -wS $0 ${1+"$@"}'
if $running_under_some_shell;
[ ... etc ... ]
It goes on, so you have a more detailed explanation there...
The line you have is similar enough to that one.
> Its like its executing itself again, but why?
>
> What the heck is: ${1+"$@"} ??
>
> Wouldn't the eval never get done because of the if 0; ??
Right. Probably your system supports #!, right? :-)
> So why eval a piece of code that willnever be eval'ed ?
I guess the line is still there for some reason... I can think of
several possibilities :-|
>
> Thanks!
>
> Lee.M - JupiterHost.Net
--
José Alves de Castro <[EMAIL PROTECTED]>
http://natura.di.uminho.pt/~jac
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