Pre-commit hook to avoid debugger commands - Ruby

pre-commit

# This script verifies if a list of "blacklist" words are presented in the files you are intended to commit such console 
# output, debugging information or keys/tokens/passwords

# Instructions:
# Put this file into your .git/hooks folder and set as executable (chmod +x pre-commit)

# If you want to skip the hook just add the --no-verify: git commit --no-verify

# ---------------------------------------------

#!/bin/sh

# Modify this
# LIST='list\|of\|words\|splitted\|by\|slash\|and\|pipe'
LIST="byebug\|debugger\|binding.pry"

if git rev-parse --verify HEAD >/dev/null 2>&1; then
    against=HEAD
else
    against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

for FILE in `git diff-index --name-status --cached $against -- | cut -c3-` ; do
    # Check if the file contains one of the words in LIST
    if grep -w $LIST $FILE; then
      echo $FILE." has one of the word you don't want to commit. Please remove it"
      exit 1
    fi
      done
exit 

#!/bin/sh

Must be on the first line of the file. Otherwise, you'd get error: cannot spawn .git/hooks/pre-commit: No such file or directory when trying to commit something.

against=4b825dc642cb6eb9a060e54bf8d69288fbee4904

I'd leave this as against=$(git hash-object -t tree /dev/null). You can see this line in the examples.