$ cat ./pm_11133472.sh
echo -n "pw$ApID"

##</code><code>##

$ ./pm_11133472.sh
pw

$ ApID=APXD_IERF ./pm_11133472.sh
pwAPXD_IERF

##</code><code>##

$ perl -e '
    for ("", "APXD_IERF") {
        $ENV{ApID} = $_;
        my $pwd = `./pm_11133472.sh`;
        print "$pwd\n";
    }
'
pw
pwAPXD_IERF