Spits out approximate memory usage of an app (passed as an argument) -- mac os 10.9+ (maybe earlier)

gistfile1.php

<?php
$app = $argv[1];
print exec('hostinfo | grep memory | perl -ne \'$used = `ps aux | grep ' .
            $app . ' | awk \'"\'"\'{x+=\$4} END{print x/100}\'"\'"\'` and /Primary memory available: (\d+)/ and printf("' .
            $app . ' is using approximately ") and printf($1*$used) and print ("GB\n");\'');