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- if test ?then? trueBody ?else? ?falseBody?
- The if command evaluates test as an expression (in the
- same way that expr evaluates its argument). The value
- of the expression must be numeric; if it is non-zero
- then trueBody is called by passing it to the Tcl
- interpreter. Otherwise falseBody is executed by
- passing it to the Tcl interpreter. The then and else
- arguments are optional ``noise words'' to make the
- command easier to read. FalseBody is also optional; if
- it isn't specified then the command does nothing if
- test evaluates to zero. The return value from if is
- the value of the last command executed in trueBody or
- falseBody, or the empty string if test evaluates to
- zero and falseBody isn't specified.
-