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  1. or download this
    #!/usr/bin/env perl

...
else {
    print( "system() return $retval\n" );
}
  2. or download this
    test$ ./test.pl 
Alarm triggered, making system call...
system() retval = -1; $? = -1; $! = No such file or directory
  3. or download this
    System 1:
$ perl -v
...

test$ uname -a
Linux hostname.removed 2.6.9-55.0.6.ELsmp #1 SMP Tue Sep 4 21:36:00 ED
+T 2007 i686 unknown