Compare enabled modules on different servers

This has come in handy once or twice when comparing enabled modules on two different servers.

drush pm-list --status=enabled --type=module --pipe > ../pm-list-enabled.txt
drush pm-list --status=enabled --type=module --pipe > ../pm-list-enabled-othersite.txt
diff pm-list-enabled.txt pm-list-enabled-othersite.txt