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cd(1)
change working directory
From the original Amiga UNIX 2.1 manual. Some things it mentions may not be in this release.
NAME
cd - change working directory
SYNOPSIS
cd [ directory ]
DESCRIPTION
If directory is not specified, the value of shell parameter $HOME is used as the new working directory. If directory specifies a complete path starting with /, ., or .., directory becomes the new working directory. If neither case applies, cd tries to find the designated directory relative to one of the paths specified by the $CDPATH shell variable. $CDPATH has the same syntax as, and similar semantics to, the $PATH shell variable. cd 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 by and is internal to the shell.
SEE ALSO
pwd(1), sh(1). chdir(2) in the Programmer's Reference Manual.