Plan 9 from Bell Labs’s /usr/web/sources/contrib/maht/acme/bin/4t
#!/bin/rc rfork cd bind -a /sys/src/cmd/4th . tags=`{cat /mnt/acme/$winid/tag} f=$tags(1) while(! ~ $tags(1) 4t) tags = $tags(2-) /bin/4th cqx $f $tags(2-)