CD(1) — UNIX 3.0
NAME
cd − change working directory
SYNOPSIS
cd [ directory ]
DESCRIPTION
If specified, directory becomes the new working directory; otherwise, the value of the shell parameter $HOME is used. The process must have execute (search) permission in directory.
Because a new process is created to execute each command, cd would be ineffective if it were written as a normal command; therefore, it is recognized and executed by the shell.
SEE ALSO
May 16, 1980