3. Use argument validation in your scripts. Listing 2 shows tee.wsf, which uses wshargex.wsc to validate arguments. Tee.wsf functions like the UNIX tee command, which reads characters from a command console's standard input stream and writes them to the standard output as well as to one or more files. Instead of writing a few lines of code to check the command-line arguments from the user, tee.wsf just passes them to the component for validation.
To use standard input and output streams, you must run the script with CScript explicitly. Just having CScript set as your default script host isn't enough to redirect the console input stream. (For a simplifying workaround, see "Convert WSH Scripts into Console Tools," March 2004, InstantDoc ID 41501.) You can use this workaround for any situation in which you want to look at the results of a command on screen and send them to a file at the same time.
The code at callout A in Listing 2 shows the script's argument specifications. I specify only two arguments; by running the script with the /? argument (a default in WSH), you can get the argument Help screen to display automatically. The first specification, the named argument "A", tells tee.wsf to append to files instead of overwriting them. The argument type is simple, meaning that it should have no data. The second specification is an unnamed argument description called "filename" in the displayed Help text. This argument is the path to one or more files to which the console will send output. The user must specify at least one file. . . .
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