Additional guidance is needed.

    'cal' is not recognized as an internal or external command, operable program or batch file.

    cal : The term 'cal' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

    At line:1 char:1
    + cal
    + ~~~
        + CategoryInfo          : ObjectNotFound: (cal:String) [], CommandNotFoundException
        + FullyQualifiedErrorId : CommandNotFoundException