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Examples The examples refer to the following states of a file: line1 line2 line3 line4 line5 State E Most recent version line1 line2 line3 line4 line1 line2 line3 line1 line2 line1 State D State C State B State A Oldest version The file starts in state A and is progressively changed to state B, then C, then D, then E. A checkpoint is taken between each state. 1. To revert to state B, one state at a time, type the following command three times: undo The first undo changes the file to state D, the second undo to state C and the third undo to state B. If there are no more changes to undo, the following message is displayed: No recorded changes available for UNDO 2. To revert 3 states directly from, for example, state E, type: undo 3 State B becomes the current state. 3. Now if you type: undo -2 The last two undos are undone, and the document returns to state D. API Return Codes -1 Parameter specified is not a number. -5 You cannot make changes to the file because the readonly parameter is set to on. “autocheck Parameter” on page 165 “changes Parameter” on page 184 “check Command” on page 70 “recording Parameter” on page 312 Chapter 8. References 141
