Git get diff file list and diff content from some branch

1. BRANCH_NAME='dev'
2. SOURCE_DIR='/home/me/src'
3. EXPORT_TO='/home/me/out'
4.  
5. cd $SOURCE_DIR
6. git diff --name-only $BRANCH_NAME > $EXPORT_TO/changes.txt
7. git diff $BRANCH_NAME > $EXPORT_TO/changes.diff
8.