The DEFSTRING Command

The first entry in the file defines the DCL TYPE command so that it is accessible directly from ICL without having to do enter DCL TYPE. This is done using the DEFSTRING command which defines an equivalence string for a command. In this case the command is TYPE and the equivalence string is DCL TYPE. The notation T(YPE) specifies possible abbreviations for the TYPE command, indicating that we could actually use T, TY or TYP instead of TYPE in full.