cd [dir]cd [-LP] [dir]cd [-LP] [-]cd [-LP] [old new]With no arguments, change to home directory of user. Otherwise, change working directory to dir.  If dir is a relative pathname but is not in the current directory, the CDPATH variable is searched.  The last three command forms are specific to the  Korn shell, where - stands for the previous directory. The fourth syntax modifies the current directory name by replacing string old with new and then switches to the resulting directory.
-LUse the logical path (what the user typed, including any symbolic links) for cd .. and the value of PWD. This is the default.
-PUse the actual filesystem physical path for cd .. and the value of PWD.
$pwd/var/spool/cron $cd cron uucpcd prints the new directory /var/spool/uucp