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. See also
vdiff,
mod.