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[PATCH 2/2] doc/SubmittingPatches: show how to get a CLI commit summary

Amend the section which describes how to get a commit summary to show
how do to that with "git show", currently the documentation only shows
how to do that with gitk.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
 Documentation/SubmittingPatches | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/Documentation/SubmittingPatches b/Documentation/SubmittingPatches
index 9ef624ce38..78c8e36a4b 100644
--- a/Documentation/SubmittingPatches
+++ b/Documentation/SubmittingPatches
@@ -134,8 +134,17 @@ with the subject enclosed in a pair of double-quotes, like this:
     noticed that ...
 The "Copy commit summary" command of gitk can be used to obtain this
+format, or this invocation of "git show":
+    git show -s --date=format:%Y-%m-%d --pretty='commit %h ("%s", %ad)' <commit>
+To turn that into a handy alias:
+    git config --global alias.git-commit-summary "show -s --date=format:%Y-%m-%d --pretty='commit %h (\"%s\", %ad)'"
+And then to get the commit summary:
+    git git-commit-summary <commit>
 (3) Generate your patch using Git tools out of your commits.