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-.TH DIFF 1
-.CT 1 files 
-.SH NAME
-diff, diff3 \- differential file comparison
-.SH SYNOPSIS
-.B diff
-[
-.I option ...
-]
-.I file1 file2
-.PP
-.B diff3
-[
-.B \-ex3
-]
-.I file1 file2 file3
-.SH DESCRIPTION
-When run on regular files
-.I diff
-tells what lines must be changed in the files to bring them into agreement.
-Except in rare circumstances,
-.I diff
-finds a smallest sufficient set of differences.
-If neither file
-is a directory, then one
-may be 
-.LR - ,
-meaning the standard input.
-If one file
-is a directory,
-then a file in that directory with basename the same as that of
-the other file is used.
-.PP
-If both files are directories,
-similarly named files in the two directories
-are compared by the method of
-.I diff
-for text files and
-.IR cmp (1)
-otherwise.
-Options when comparing directories are:
-.TP
-.B -r
-Apply
-.I diff
-recursively to similarly named subdirectories.
-.TP
-.B -s
-Report files that are the same (normally not mentioned).
-.PP
-There are several options for output format;
-the default output format contains lines of these forms:
-.IP
-.IB n1 a
-.IB n3 , n4
-.br
-.IB n1 , n2 d
-.I n3
-.br
-.IB n1 , n2 c
-.IB n3 , n4
-.PP
-These lines resemble
-.I ed
-commands to convert
-.I file1
-into
-.IR file2 .
-The numbers after the letters pertain to
-.IR file2 .
-In fact, by exchanging 
-.L a
-for 
-.L d
-and reading backward
-one may ascertain equally how to convert 
-.I file2
-into
-.IR file1 .
-As in 
-.I ed,
-identical pairs where
-.IR n1 = n2
-or
-.I n3 = n4
-are abbreviated as a single number.
-.PP
-Following each of these lines come all the lines that are
-affected in the first file flagged by 
-.LR < ,
-then all the lines that are affected in the second file
-flagged by 
-.LR > .
-.PP
-.TP
-.B -e
-Produce a script of
-.LR a ,
-.LR c ,
-and 
-.L d
-for
-.IR ed (1)
-to recreate
-.I file2
-from
-.IR file1 .
-When comparing directories, produce a
-.IR sh (1)
-script to convert text files common to the two directories.
-.TP
-.BI -c n
-Include
-.I n
-extra lines of context with each set of differences.
-The output format is modified:
-the output begins with identification of the files involved and
-their creation dates and changes are separated
-by lines of *'s.
-Lines removed from
-.I file1
-are marked with
-.LR - ;
-those added to
-.I file2
-are marked 
-.LR + .
-Lines which are changed from one
-file to the other are marked in both files with 
-.LR ! .
-.TP
-.B -h
-Do a fast, half-hearted job,
-useful only when changed stretches are short
-and well separated,
-but does work on files of unlimited length.
-.TP
-.B -b
-Ignore trailing blanks (spaces and tabs) and treat other
-strings of blanks as if they were a single space. 
-.TP
-.B -B
-Ignore all blanks.
-.PP
-.I Diff3
-compares three versions of a file
-and publishes the various disagreeing ranges of text.
-One of the following indicators introduces each reported
-difference.
-.TP
-.B ====
-All three files differ.
-.TP
-.BI ==== f
-File
-.I f
-differs, where
-.I f
-is 1, 2, or 3.
-.PP
-Disagreeing fragments from the three files follow the
-.B ====
-line, each identified by a
-.IR diff -like
-range indication:
-.TP
-.IB f  :  n1  a
-File
-.I f
-lacks text that other files have; their text would
-be appended after line
-.I n1.
-.TP
-.IB f : n1 , n2 c
-.br
-.ns
-.TP
-.IB f : n1 c
-Lines
-.I n1
-through
-.I n2
-(or line
-.I n1
-only) of file
-.I f
-would have to be changed to agree with some other file.
-The original contents follow, unless a higher-numbered file
-has the same contents.
-.PP
-Under option
-.BR -e ,
-.I diff3
-publishes a script for 
-.IR ed (1)
-that will incorporate into
-.I file1
-all changes between
-.I file2
-and
-.I file3,
-i.e. the changes that normally would be flagged 
-.B ====
-and
-.BR ====3 .
-Option
-.B \-x
-(\fB\-3\fR)
-produces a script to incorporate
-only changes flagged 
-.B ====
-.RB ( ====3 ).
-.SH EXAMPLES
-.TP
-.L
-(cat diff0-1 diff1-2 diff2-3; echo '1,$p') | ed - file0 >file3
-An ancestral
-.L file0
-has been kept along with a chain of version-to-version
-difference files made thus:
-.LR "diff -e file0 file1 >diff0-1" .
-The shell command reconstructs the latest version.
-.PP
-.EX
-if diff3 mod1 old mod2 | grep -s '^====$'
-then :
-else (diff3 -e mod1 old mod2; echo '1,$p') | ed - mod1 >new
-fi
-.EE
-.PD0
-.IP
-Compare two different modified versions with an old file.
-If no modifications interfere with each other
-.RI ( grep
-finds no 
-.B ====
-lines), make a new file incorporating both modifications.
-.PD
-.SH FILES
-.F /tmp/d*
-.br
-.F /usr/lib/diffh
-for 
-.B -h
-.br
-.F /usr/lib/diff3
-.SH "SEE ALSO"
-.IR cmp (1),
-.IR comm (1), 
-.IR ed (1),
-.IR idiff (1)
-.SH DIAGNOSTICS
-.I Diff
-yields exit status is 0 for no differences, 1 for some, 2 for trouble.
-.SH BUGS
-Text lines that consist of a single `.' will
-defeat options
-.BR -e ,
-.BR -x ,
-and
-.BR -3 .
-.br
-Superfluous output may result for files that differ
-only in insignificant blanks when comparing directories
-under option
-.BR -b .
-.br
-Option
-.B -c
-is unpardonably bizarre.