PS TEXT EDIT Reference Manual

UNDO
TEDIT Commands
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UNDO UNDO reverses the last command or action that altered text, and then
returns the text to its previous condition.
What to Enter
[ repeat-count ] { UNDO | UND }
repeat-count
is the number of times to repeat this command. See “Repeat Count” in
Section 2 for details.
Examples:
1. To reverse the last change to text, enter:
Command: UNDO
2. To reverse the last six changes you made to your text, use a repeat
count; then enter:
Command: 6 UNDO
How to Use
Use UNDO to reverse previous changes, starting with the most recent.
What Happens
Whenever you alter text, TEDIT records not only this change but all the
previous changes since you began this editing session.
By giving successive UNDO commands, you can reverse all text changes in
the current editing session. TEDIT repositions the cursor to where it was in
the file just prior to the text change UNDO performs.