Using NAWK to merge two files

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git-merge-index

GIT-MERGE-INDEX(1)						    Git Manual							GIT-MERGE-INDEX(1)

NAME

       git-merge-index - Run a merge for files needing merging

SYNOPSIS

       git merge-index [-o] [-q] <merge-program> (-a | [--] <file>*)

DESCRIPTION

       This looks up the <file>(s) in the index and, if there are any merge entries, passes the SHA-1 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.

OPTIONS

       --
	   Do not interpret any more arguments as options.

       -a
	   Run merge against all files in the index that need merging.

       -o
	   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.

       -q
	   Do not complain about a failed merge program (a merge program failure usually indicates conflicts during the 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
       code.

       Typically this is run with a script calling Git's imitation of the merge command from the RCS package.

       A sample script called git merge-one-file is included in the distribution.

       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.

       Examples:

	   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

       or

	   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 (i.e., 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).

GIT

       Part of the git(1) suite

Git 2.17.1							    10/05/2018							GIT-MERGE-INDEX(1)

Shell Programming and Scripting