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+#!/bin/sh
+#
+# An example hook script to check the commit log message.
+# Called by git-commit with one argument, the name of the file
+# that has the commit message. The hook should exit with non-zero
+# status after issuing an appropriate message if it wants to stop the
+# commit. The hook is allowed to edit the commit message file.
+#
+# To enable this hook, make this file executable.
+
+# This example catches duplicate Signed-off-by lines.
+
+test "" = "$(grep '^Signed-off-by: ' "$1" |
+ sort | uniq -c | sed -e '/^[ ]*1 /d')"