diffutils: Forward ed
2.5.2 Forward 'ed' Scripts
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'diff' can produce output that is like an 'ed' script, but with hunks in
forward (front to back) order. The format of the commands is also
changed slightly: command characters precede the lines they modify,
spaces separate line numbers in ranges, and no attempt is made to
disambiguate hunk lines consisting of a single period. Like 'ed'
format, forward 'ed' format cannot represent incomplete lines.
Forward 'ed' format is not very useful, because neither 'ed' nor
'patch' can apply diffs in this format. It exists mainly for
compatibility with older versions of 'diff'. Use the '-f' or
'--forward-ed' option to select it.
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diffutils: ed Scripts
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