cd - change working directory
cd [ directory ]
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 /, ., .., 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 and is internal to the shell.
pwd(1), sh(1), chdir(2).
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