The CoCo wiki project was started on October 29, 2004. --OS-9 Al

From CoCopedia

CHX

CHX is used to change the current execution directory. This is were NitrOS-9 will look commands. If the requested command is not found in the current execution directory, it will look for it in the current working directory.

/dd/CMDS is the default execution directory.

PXD can be used to print the current execution directory.

Syntax: CHX <pathlist>