ksh built in commands

Sometimes it can be confusing to know where to find more info about built in shell commands.

man cd
cd - ATAPI and SCSI CD-ROM driver

man 1 cd  
man: No entry for cd in the manual.

A suitable alias is there to help

type cd
cd is a shell builtin

type type
type is an alias for 'whence -v'

So you can find info about cs in ksh manual. Search the long man page using /cd <ENTER>

man ksh    
cd [-LP] old new
         The string new is substituted for old in the current directory,
         and the shell attempts to change to the new directory.