cd(1)
Name
cd − change current directory
Syntax
cd directory
Description
The directory becomes the new working directory. 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. It is therefore recognized and executed by the shells. In csh you may specify a list of directories in which directory is to be sought as a subdirectory if it is not a subdirectory of the current directory; see the description of the cdpath variable in csh(.).