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- incr varName ?increment?
- Increment the value stored in the variable whose name
- is varName. The value of the variable must be
- integral. If increment is supplied then its value
- (which must be an integer) is added to the value of
- variable varName; otherwise 1 is added to varName.
- The new value is stored as a decimal string in variable
- varName and also returned as result.
-