Diff: /dif/ N. 1. A Change Listing, Especially Giving Differences Between (and Additions To) Source Code Or Documents (the Term Is Often Used In The Plural `diffs').

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:diff: /dif/ n. 1. A change listing, especially giving
differences between (and additions to) source code or documents
(the term is often used in the plural `diffs'). "Send me your
diffs for the Jargon File!" Compare {vdiff}. 2. Specifically,
such a listing produced by the `diff(1)' command, esp. when
used as specification input to the `patch(1)' utility (which
can actually perform the modifications; see {patch}). This is a
common method of distributing patches and source updates in the
UNIX/C world. 3. v. To compare (whether or not by use of automated
tools on machine-readable files); see also {vdiff},
-- The AI Hackers Dictionary