TSO/E provides an initialization exit and a termination exit for the FREE command. You can use the exits to customize FREE processing for your users. The initialization exit receives control before the FREE command processor invokes the parse service routine to parse the command. The termination exit receives control just before the FREE command processor completes processing. If the initialization exit returns successfully to the FREE command processor and FREE processing itself abends, the FREE command processor invokes the termination exit before it terminates.

You can use the initialization exit to change the operands that users specify on the command or correct user errors when they issue the command. You can use the termination exit to perform clean-up or special processing prior to FREE completion. Depending on the processing your initialization exit performs, you may not need a corresponding termination exit.