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+v0.1, May 2005
+git-merge-index - Runs a merge for files needing merging
+'git-merge-index' [-o] [-q] <merge-program> (-a | -- | <file>\*)
+This looks up the <file>(s) in the cache and, if there are any merge
+entries, passes the SHA1 hash for those files as arguments 1, 2, 3 (empty
+argument if no file), and <file> as argument 4. File modes for the three
+files are passed as arguments 5, 6 and 7.
+ Interpret all following arguments as filenames.
+ Run merge against all files in the cache that need merging.
+ Instead of stopping at the first failed merge, do all of them
+ in one shot - continue with merging even when previous merges
+ returned errors, and only return the error code after all the
+ merges are over.
+ Do not complain about failed merge program (the merge program
+ failure usually indicates conflicts during merge). This is for
+ porcelains which might want to emit custom messages.
+If "git-merge-index" is called with multiple <file>s (or -a) then it
+processes them in turn only stopping if merge returns a non-zero exit
+Typically this is run with the a script calling the merge command from
+the RCS package.
+A sample script called "git-merge-one-file" is included in the
+ALERT ALERT ALERT! The git "merge object order" is different from the
+RCS "merge" program merge object order. In the above ordering, the
+original is first. But the argument order to the 3-way merge program
+"merge" is to have the original in the middle. Don't ask me why.
+ torvalds@ppc970:~/merge-test> git-merge-index cat MM
+ This is MM from the original tree. # original
+ This is modified MM in the branch A. # merge1
+ This is modified MM in the branch B. # merge2
+ This is modified MM in the branch B. # current contents
+ torvalds@ppc970:~/merge-test> git-merge-index cat AA MM
+ cat: : No such file or directory
+ This is added AA in the branch A.
+ This is added AA in the branch B.
+ This is added AA in the branch B.
+ fatal: merge program failed
+where the latter example shows how "git-merge-index" will stop trying to
+merge once anything has returned an error (ie "cat" returned an error
+for the AA file, because it didn't exist in the original, and thus
+"git-merge-index" didn't even try to merge the MM thing).
+Written by Linus Torvalds <>
+One-shot merge by Petr Baudis <>
+Documentation by David Greaves, Junio C Hamano and the git-list <>.
+Part of the link:git.html[git] suite