1981 Misunderstanding about Unix.. in fa.unix-wizards (Usenet newsgroup) 12 Aug. It has arbitrary abbreviations, <escape> command completion, the question-mark help facility, and a delete-undelete-expunge facility.

1983 College Composition & Communication 34 137 ‘Undelete’ and backup copies assure writers that they will be able to retrieve any hastily or mistakenly deleted words.

1991 What Personal Computer Dec. 207/1 Features include..time tamer, file undelete, view files..and more.

2005 N.Y. Times (National ed.) 3 Nov. c9/1 Until that overwriting occurs, the old data can be retrieved with undelete programs and tools used by data recovery labs and law enforcement agencies.

1981 Coll. Responses on Extensibility & Design in fa.works (Usenet newsgroup) 27 July I..usually..pause a moment to make sure that I mean what I am about to type (delete region, undelete region, filter region, etc.).

1984 S. Curran Word Processing for Beginners viii. 87 If deleted text is saved in the block buffer, or a special delete buffer, it may be possible to ‘undelete’ accidentally deleted text.

1995 Family PC Dec. 49/1 Windows has a..trashcan, called the Recycle Bin, that lets you delete files and folders..or undelete files you've jettisoned too soon.

2002 J. Zagel Money to Burn v. xv. 302 They may be able to find the originals on the drive... They have people who can undelete it, sometimes.