This indir shebang thing is handled in toke.c

I found here that indir was a program to call indirectly other programs:

If I recall correctly, 'indir' was a program designed to indirectly 
execute other programs.  My recollection is that it was supposed to be
+ 
particularly useful in setuid situations where the OS didn't natively 
provide you much help, and/or perhaps in situations where the OS kerne
+l 
limited you to 32 character command lines.

> Personally I wouldn't object to the removal of this exec feature. Bu
+t
> at the very least shouldn't we document that "indir" thing ?

I don't think indir is actively maintained, and we don't recommend
doing setuid scripts this way anymore either, so removing the 'indir' 
special case is probably appropriate.
[download]

L*

Thanks, that was it exactly. (I really love how you said I encountered a dark corner. :)

https://perl5.git.perl.org/perl.git/blob/e4c924d2eed0ac25e00e510c6a18d3a562019c28:/toke.c#l5521

perl shebang indir

If I recall correctly, 'indir' was a program designed to indirectly execute other programs. My recollection is that it was supposed to be particularly useful in setuid situations where the OS didn't natively provide you much help, and/or perhaps in situations where the OS kernel limited you to 32 character command lines.

Thanks, the p5p link is what I was looking for.