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git-merge-file - Run a three-way file merge
'git merge-file' [-L <current-name> [-L <base-name> [-L <other-name>]]]
[--ours|--theirs|--union] [-p|--stdout] [-q|--quiet] [--marker-size=<n>]
<current-file> <base-file> <other-file>
'git merge-file' incorporates all changes that lead from the `<base-file>`
to `<other-file>` into `<current-file>`. The result ordinarily goes into
`<current-file>`. 'git merge-file' is useful for combining separate changes
to an original. Suppose `<base-file>` is the original, and both
`<current-file>` and `<other-file>` are modifications of `<base-file>`,
then 'git merge-file' combines both changes.
A conflict occurs if both `<current-file>` and `<other-file>` have changes
in a common segment of lines. If a conflict is found, 'git merge-file'
normally outputs a warning and brackets the conflict with lines containing
<<<<<<< and >>>>>>> markers. A typical conflict will look like this:
<<<<<<< A
lines in file A
lines in file B
>>>>>>> B
If there are conflicts, the user should edit the result and delete one of
the alternatives. When `--ours`, `--theirs`, or `--union` option is in effect,
however, these conflicts are resolved favouring lines from `<current-file>`,
lines from `<other-file>`, or lines from both respectively. The length of the
conflict markers can be given with the `--marker-size` option.
The exit value of this program is negative on error, and the number of
conflicts otherwise. If the merge was clean, the exit value is 0.
'git merge-file' is designed to be a minimal clone of RCS 'merge'; that is, it
implements all of RCS 'merge''s functionality which is needed by
-L <label>::
This option may be given up to three times, and
specifies labels to be used in place of the
corresponding file names in conflict reports. That is,
`git merge-file -L x -L y -L z a b c` generates output that
looks like it came from files x, y and z instead of
from files a, b and c.
Send results to standard output instead of overwriting
Quiet; do not warn about conflicts.
Instead of leaving conflicts in the file, resolve conflicts
favouring our (or their or both) side of the lines.
`git merge-file README README.upstream`::
combines the changes of and README.upstream since README,
tries to merge them and writes the result into
`git merge-file -L a -L b -L c tmp/a123 tmp/b234 tmp/c345`::
merges tmp/a123 and tmp/c345 with the base tmp/b234, but uses labels
`a` and `c` instead of `tmp/a123` and `tmp/c345`.
Part of the linkgit:git[1] suite
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