Creating Variables

You can create your own variables and change their values. When using variables, the following guidelines apply:
  • Variable names are case insensitive and are limited to 32 characters.
  • The variable name must be unique.
  • A variable can be referenced as $X or $(X).
  • If a variable already exists, it is overwritten. No error message is displayed.
  • The variable expression can be a constant value, another variable, or a combination of the above with operators and functions. Operators are described in , and functions are described in .
  • Only the set var command supports expression evaluation.
  • If the variable name X contains special characters such as +-/*, then the variable needs to be enclosed in parentheses. For example: set var z ($(x) + 100).
  • When you use a variable with a TCL special character in the $TCL function, the variable must be enclosed in braces. For example: set var x $TCL(string length ${CLI.USER}.
  • For more information on TCL functions, see Using Built-In Functions.


    ExtremeXOS does not consider the dot/period character as a de-limiter. This is different from standard TCL behavior, where dot/period is considered as a de-limiter.