## Tcl8.6.2/Tk8.6.2 Documentation > Tcl Commands, version 8.6.2 > cd

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### NAME

cd — Change working directory

### SYNOPSIS

cd ?dirName?

### DESCRIPTION

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.

### EXAMPLES

Change to the home directory of the user fred:

    cd ~fred

Change to the directory lib that is a sibling directory of the current one:

    cd ../lib

### SEE ALSO

filename, glob, pwd

### KEYWORDS

working directory
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