HPlogo Interprocess Communication: Programmer's Guide: HP 3000 MPE/iX Computer Systems > Chapter 2 IPC Using Job Control Words and Other Variables

Variable Commands

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You can also manipulate variables by using various MPE/iX commands. These are the following:

:SETVAR

This command can be used to set or alter a variable (including JCWs) in the variable table. The syntax is as follows:


   :SETVAR varname, expression 

The varname must be a valid MPE/iX variable name, either of an existing variable or of a new one. A space or comma must precede the expression parameter, if you use it. Expression can be a string, an integer, a Boolean value, an expression, or the name of another variable. SETVAR always evaluates expression; certain operators can be used in this parameter, as well as numeric values.

:SHOWVAR

Use this command to display a selected variable or variables from the variable table. This command displays JCWs as well as standard variables.

Entering :SHOWVAR without parameters shows you a list of all variables and values that you have set. You can enter a variable name (or more than one, separated by commas) to see the variable's value.

You can also use "wild card" characters such as ?, #, [m-n], and @. Entered by itself, @ causes :SHOWVAR to display a list of all variables, both user-created and predefined. Or you can use it in a variable name to signify "zero or more alphanumeric characters."

:DELETEVAR

This command enables you to delete any user-created variable from the variable table. Again, you can delete JCWs as well as standard variables by using this command.

The one required parameter is varname, the name of the variable to be deleted. You may enter more than one varname at a time, separated by commas. Predefined variables cannot be deleted. The same wild card characters allowed in :SHOWVAR are also valid here.

For more information and syntax descriptions for the above commands, refer to the MPE/iX Commands Reference Manual (32650-90003).

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