I'd avoid reimplementing how your shell uses $PATH. If this command is being run in a wrapper, it could be as simple as a commandline argument, 
$ perl ./my/script.pl $(which myprogram)

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If you don't know the name of the program at first, then, 
  my $full_program = `which $program`;
  chomp $full_program;

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Note: which will not "find" a program in $PATH for a file where -x is not also true. In other words, which requires the "found" file to have executable permissions by the effective user. So, yeah; don't try to reimplement which.

In reply to Re: Check for another program availability by perlfan
in thread Check for another program availability by hrcerq

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