Then you probably want to use fork and exec together like this:

# we're in the "main program"...

my $child = fork();
die "fork failed: $!" unless ( defined( $child ));
if ( $child == 0 ) {
    # the child process does this:
    exec( 'other_program', @args );
}
# the parent now goes on to do whatever follows, while the child is ru
+nning...
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