git pre-commit hook don't echo files changed

Tools/pre-commit

@@ -1,6 +1,4 @@
 #!/bin/sh
-echo "hello world"
-
 if git rev-parse --verify HEAD >/dev/null 2>&1
 then
   against=HEAD
@@ -15,7 +13,6 @@ exec 1>&2
 CHANGED_FILES=`git diff --cached --name-only --diff-filter=ACM $against | grep '\.c\|\.cpp\|\.h\|\.hpp'`
 FAILED=0
 if [ ! -z "$CHANGED_FILES" -a "$CHANGED_FILES" != " " ]; then
-  echo $CHANGED_FILES
   for FILE in $CHANGED_FILES; do
     ./Tools/fix_code_style.sh --quiet < $FILE > $FILE.pretty
     diff -u $FILE $FILE.pretty || FAILED=1