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- cd ?dirName?
- Change the current working directory to dirName, or to
- the home directory (as specified in the HOME
- environment variable) if dirName is not given. If
- dirName starts with a tilde, then tilde-expansion is
- done as described for Tcl_TildeSubst. Returns an empty
- string. This command can potentially be disruptive to
- an application, so it may be removed in some
- applications.
-