git commit hooks

.git

$ cat .git/hooks/pre-commit
#!/bin/sh

DIFF=`git diff HEAD`+`git diff --cached HEAD`

if [[ "$DIFF" == *"DO NOT COMMIT"* ]]
then
  echo "Error; Attempt to commit a delta including the phrase 'DO NOT COMMIT'";
  echo
  echo "Use --no-verify to bypass this check."
  echo
  exit 1
fi

if [[ "$DIFF" == *"<<<<<<<"* ]]
then
  echo "Error; Looks like you have a bad merge - due to the phrase '<<<<<<<'";
  echo
  echo "Use --no-verify to bypass this check."
  echo
  exit 1
fi