'type' and 'command -v' don't work on posh. The which command works, of course, but it is in /usr/bin/. $ cd / jdthood@thanatos:/$ posh $ type ls posh: type: not found $ command ls bin dev etc initrd lost+found mntcdrom proc sbin sys usr boot dev.tar home lib mnt opt root share tmp var $ command -v ls command: invalid option -- v $ which which /usr/bin/which -- Thomas Hood