Compare three files line by line.
-e --ed
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Output unmerged changes from OLDFILE to YOURFILE into MYFILE.
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-E --show-overlap
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Output unmerged changes, bracketing conflicts.
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-A --show-all
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Output all changes, bracketing conflicts.
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-x --overlap-only
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Output overlapping changes.
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-X
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Output overlapping changes, bracketing them.
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-3 --easy-only
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Output unmerged nonoverlapping changes.
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-m --merge
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Output merged file instead of ed script (default -A).
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-L LABEL --label=LABEL
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Use LABEL instead of file name.
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-i
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Append `w' and `q' commands to ed scripts.
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-a --text
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Treat all files as text.
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--strip-trailing-cr
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Strip trailing carriage return on input.
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-T --initial-tab
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Make tabs line up by prepending a tab.
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--diff-program=PROGRAM
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Use PROGRAM to compare files.
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-v --version
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Output version info.
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--help
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Output this help.
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If a FILE is `-', read standard input.
Exit status is 0 if successful, 1 if conflicts, 2 if trouble.