208 lines
3.6 KiB
Groff
208 lines
3.6 KiB
Groff
.TH DIFF3 1 "22sep1993" "GNU Tools" "GNU Tools"
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.SH NAME
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diff3 \- find differences between three files
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.SH SYNOPSIS
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.B diff3
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[options] mine older yours
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.SH DESCRIPTION
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The
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.I diff3
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command compares three files and outputs descriptions
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of their differences.
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The files to compare are
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.IR mine ,
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.IR older ,
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and
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.IR yours .
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At most one of these three file names may be
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.BR \- ,
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which tells
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.I diff3
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to read the standard input for that file.
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.SS Options
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Below is a summary of all of the options that GNU
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.I diff3
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accepts. Multiple single letter options (unless they take an argument)
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can be combined into a single command line argument.
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.TP
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.B \-a
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Treat all files as text and compare them line-by-line, even if they
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do not appear to be text.
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.TP
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.B \-A
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Incorporate all changes from
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.I older
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to
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.I yours
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into
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.IR mine ,
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surrounding all conflicts with bracket lines.
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.TP
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.B \-e
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Generate an
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.I ed
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script that incorporates all the changes from
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.I older
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to
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.I yours
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into
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.IR mine .
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.TP
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.B \-E
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Like
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.BR \-e ,
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except bracket lines from overlapping changes' first
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and third files.
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With
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.BR \-e ,
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an overlapping change looks like this:
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.sp
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.nf
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<<<<<<< \fImine\fP
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lines from \fImine\fP
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=======
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lines from \fIyours\fP
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>>>>>>> \fIyours\fP
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.fi
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.TP
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.B \-\-ed
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Generate an
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.I ed
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script that incorporates all the changes from
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.I older
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to
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.I yours
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into
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.IR mine .
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.TP
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.B \-\-easy\-only
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Like
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.BR \-e ,
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except output only the nonoverlapping changes.
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.TP
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.B \-i
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Generate
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.B w
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and
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.B q
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commands at the end of the
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.I ed
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script for System V compatibility. This option must be combined with
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one of the
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.B \-AeExX3
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options, and may not be combined with
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.BR \-m .
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.TP
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.B \-\-initial\-tab
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Output a tab rather than two spaces before the text of a line in normal format.
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This causes the alignment of tabs in the line to look normal.
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.TP
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.BI "\-L " label
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.ns
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.TP
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.BI \-\-label= label
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Use the label
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.I label
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for the brackets output by the
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.BR \-A ,
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.B \-E
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and
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.B \-X
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options. This option may be given up to three
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times, one for each input file. The default labels are the names of
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the input files. Thus
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.B "diff3 \-L X \-L Y \-L Z \-m A B C"
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acts like
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.BR "diff3 \-m A B C ,
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except that the output looks like it came from
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files named
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.BR X ,
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.B Y
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and
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.B Z
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rather than from files
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named
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.BR A ,
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.B B
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and
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.BR C .
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.TP
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.B \-m
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.br
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.ns
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.TP
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.B \-\-merge
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Apply the edit script to the first file and send the result to standard
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output. Unlike piping the output from
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.I diff3
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to
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.IR ed ,
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this
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works even for binary files and incomplete lines.
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.B \-A
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is assumed
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if no edit script option is specified.
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.TP
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.B \-\-overlap\-only
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Like
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.BR \-e ,
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except output only the overlapping changes.
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.TP
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.B \-\-show\-all
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Incorporate all unmerged changes from
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.I older
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to
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.I yours
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into
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.IR mine ,
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surrounding all overlapping changes with bracket lines.
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.TP
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.B \-\-show\-overlap
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Like
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.BR \-e ,
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except bracket lines from overlapping changes' first
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and third files.
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.TP
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.B \-T
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Output a tab rather than two spaces before the text of a line in normal format.
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This causes the alignment of tabs in the line to look normal.
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.TP
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.B \-\-text
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Treat all files as text and compare them line-by-line, even if they
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do not appear to be text.
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.TP
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.B \-v
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.br
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.ns
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.TP
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.B \-\-version
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Output the version number of
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.IR diff3 .
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.TP
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.B \-x
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Like
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.BR \-e ,
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except output only the overlapping changes.
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.TP
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.B \-X
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Like
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.BR \-E ,
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except output only the overlapping changes.
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In other words, like
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.BR \-x ,
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except bracket changes as in
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.BR \-E .
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.TP
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.B \-3
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Like
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.BR \-e ,
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except output only the nonoverlapping changes.
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.SH SEE ALSO
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cmp(1), comm(1), diff(1), ed(1), patch(1), sdiff(1).
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.SH DIAGNOSTICS
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An exit status of 0 means
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.I diff3
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was successful, 1 means some
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conflicts were found, and 2 means trouble.
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