How to stay up track changes in git projects

update.sh

#!/bin/sh

# Step 1: clone projects into directories with a leading "git-":
#
#     git clone http://foo.org/foo.git git-foo
#     git clone http://bar.org/bar.git git-bar
#
# Step 2: some hours/days/weeks later, run this script:
#
#     ./update.sh
#
# Step 3: profit!

for i in git-*; do
	(
		LOGFILE=${i#git-}.diff
		echo "---> $i"
		test -f $LOGFILE && continue
		cd $i
		git pull 2>&1
		git log --reverse -p ORIG_HEAD..HEAD | tee ../$LOGFILE
		test -s ../$LOGFILE || rm -f ../$LOGFILE
	)
done