PS TEXT EDIT Reference Manual

UNDO
TEDIT Commands
058059 Tandem Computers Incorporated 3–199
Tips
With the UNDO command you can erase text entered or changed with
keyboard keys as well as some function keys.
UNDO does not affect the following commands because they do not
alter text:
Cursor moving commands like TAB, FORWARD, DISPLAYLINE
or SEARCH.
Scrolling commands like NEXTPAGE or LEFTSCROLL.
Commands that affect text in the scratchpad or another file like
COPY or WRITE (but UNDO does act on RETRIEVE).
Window commands like OPENWINDOW or SWITCHWINDOW.
Commands that deal with (change or save) profile settings like
RECONFIGURE or SAVEPROFILE.
Utility commands like CANCEL, RUN, RULER, and
SHOWNUMBER (but UNDO does act on RENUMBER if audit is
set to YES).
UNDO does not remove text that is placed in the scratchpad.
You can enter a repeat count before the UNDO command to reverse a
number of text changes in the current editing session.
Related Commands
CANCEL ignores the last command that you gave.
REDO reverses the effect of UNDO.