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    my @args = map{ ($_, foo($arg{$_})) } keys %args;
    my @output = `/bin/foo @args`;

  system( '/bin/foo    -p    stuff' ); # passes by the shell
  system( '/bin/foo', '-p', 'stuff' ); # bypasses the shell

  my @out = `/bin/foo`, qw/-p stuff/;

my $pid;
if( !defined($pid = open( KIDP, '-|' ))) {
...
     exec '/usr/local/bin/check-netscreen', @args;
     die "ping child died \$!=$! \$@=$@\nargs = @args";
}

#! /usr/bin/perl -w

use strict;

my @out = readpipe( '/bin/foo', qw/one two three/ );