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-rw-r--r--Documentation/git.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/git.txt b/Documentation/git.txt
index 9defc33273..8fa1a0a588 100644
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -315,6 +315,14 @@ git so take care if using Cogito etc.
index file. If not specified, the default of `$GIT_DIR/index`
is used.
+'_GIT_INDEX_OUTPUT'::
+ When this environment is defined, plumbing level
+ commands that update the index writes the resulting
+ index to this file, instead of `$GIT_INDEX_FILE` (or its
+ default `$GIT_DIR/index`). This is solely meant to be
+ used by Porcelain to drive low-level plumbing. Defining
+ this in user's environment is always an error.
+
'GIT_OBJECT_DIRECTORY'::
If the object storage directory is specified via this
environment variable then the sha1 directories are created