| ActiveTcl User Guide |

### Tcl >> Tcl Built-In Commands >> System Related

System Related
    cd - Change working directory
    clock - Obtain and manipulate dates and times
    exec - Invoke subprocesses
    exit - End the application
    glob - Return names of files that match patterns
    pid - Retrieve process identifiers
    pwd - Return the absolute path of the current working directory
    time - Time the execution of a script

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