git pre-commit hook to protect debugging code and syntax error

pre-commit

#!/usr/bin/env bash

changed_files=`git status --short | grep '^[AMCU]' | awk '{print $2}' | grep -P '\.(rb|erb)'`

if [ -z "$changed_files" ]; then
        exit 0
fi

while read -r file; do
        result=`grep -rin 'binding.pry\|debugger' $file`

        if [ -n "$result" ]
        then
                echo "Cannot be commited because: $result ."
                exit 1
        fi  
done <<< "$changed_files"


ruby_files=`git status --short | grep -v '^D' | awk '{print $2}' | grep '\.rb$'`

if [ -z "$ruby_files" ]; then
        exit 0
fi

while read -r file; do
        ruby_syntax=`ruby -c $file 2>&1`

        if [ $? -ne 0 ] 
        then
                echo "Cannot be commited because ruby syntax error:"
                echo "$ruby_syntax"
                exit 1
        fi  
done <<< "$ruby_files"