script to make linear history (fast forward) in git

fast-forward-merge.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash 
+
+if [ $# -eq 0 ]
+  then
+    echo "$(basename "$0") GIT_REPO FORK_USER_NAME USER_BRANCH
+example:
+
+    ./$(basename "$0") checkstyle konstantinos issue73
+"
+	exit 0;
+fi
+
+GIT_REPO=$1
+FORK_USER_NAME=$2
+USER_BRANCH=$3
+REPO=$FORK_USER_NAME-fork
+LOCAL_USER_BRANCH=$FORK_USER_NAME-$USER_BRANCH
+
+echo "adding remote ..."
+git remote add $REPO https://github.com/$FORK_USER_NAME/$GIT_REPO.git
+git fetch $REPO
+
+echo "creating local branch ..."
+git checkout -b $LOCAL_USER_BRANCH $REPO/$USER_BRANCH
+
+echo "rebasing over master ..."
+git rebase master
+
+echo "merge to master ..."
+git checkout master
+git merge $LOCAL_USER_BRANCH
+
+echo "removing local branch ..."
+git branch -D $LOCAL_USER_BRANCH
+
+echo "removing remote ..."
+git remote rm $REPO