Re: shebang pointing to script?

[rspier@speed.seas.upenn.edu (Robert Spier)]

I _think_ I've figured out what you're trying to get at.  Or.. I may
be completely off the bat.

You're expecting $0 to be equivalent to C's argv[0] -- but it's not.
They are similar and have some of the same capabilities, but are different.

(from perlvar.pod)
     $0      Contains the name of the file containing the Perl
               script being executed.  On some operating systems
               assigning to "$0" modifies the argument area that
               the ps(1) program sees.  This is more useful as a
               way of indicating the current program state than
               it is for hiding the program you're running.
               (Mnemonic: same as sh and ksh.)

--- t1.pl ---
#!/usr/bin/perl
print "I am t1.pl -- but \$0 is $0\n";
--- t2.pl ---
#!/usr/bin/perl
exec './t1.pl' '-george';
--- t3.pl ---
#!/usr/bin/perl
exec './argv0' '-george';
--- argv0.c ---
#include <stdio.h>
int main(int argc,char **argv) {
  printf("argv[0] = %s\n",argv[0]);
}


./t1.pl --> 
I am t1.pl -- but $0 is ./t1.pl

./t2.pl -->      
I am t1.pl -- but $0 is ./t1.pl

./t3.pl -->
argv[0] = -george

So... I don't think you can do what you want with $0.

It's also exec, which will actually replace the current process with
the new one.  So it's actually starting up a completely new
/usr/bin/perl process.

Maybe what you want can be achived with C< do >?

-R



**Majordomo list services provided by PANIX <URL:http://www.panix.com>**
**To Unsubscribe, send "unsubscribe phl" to majordomo@lists.pm.org**