pre-commit hook for git

pre-commit.sh

#!/bin/bash

# Redirect output to stderr.
exec 1>&2
# enable user input
exec < /dev/tty

consoleregexp='console.log'
printregexp='print '
# CHECK
if [[ $(git diff --cached | grep $consoleregexp | wc -l) != 0 ]] || [[ $(git diff --cached | grep $printregexp | wc -l) != 0 ]]
then
  exec git diff --cached | grep -ne $consoleregexp
  read -p "There are some occurrences of console.log or print at your modification. Are you sure want to continue? (y/n)" yn
  echo $yn | grep ^[Yy]$
  if [ $? -eq 0 ]
  then
    exit 0; #THE USER WANTS TO CONTINUE
  else
    exit 1; # THE USER DONT WANT TO CONTINUE SO ROLLBACK
  fi
fi