cd - Change working directory
Change the current working directory to dirName, or to the
home directory (as specified in the HOME environment variable) if
dirName is not given.
Returns an empty string.
Note that the current working directory is a per-process resource; the
cd command changes the working directory for all interpreters
and (in a threaded environment) all threads.
Change to the home directory of the user fred:
Change to the directory lib that is a sibling directory of the
filename, glob, pwd
Copyright © 1993 The Regents of the University of California.
Copyright © 1994-1996 Sun Microsystems, Inc.
Copyright © 1995-1997 Roger E. Critchlow Jr.