git hook to run a command after `git pull` if a specified file was changed.In this example it's used to run `npm install` if package.json changed and `bower install` if `bower.json` changed.Run `chmod +x post-merge` to make it executable then put it into `.git/hooks/`.

post-merge

#!/usr/bin/env bash
# MIT © Sindre Sorhus - sindresorhus.com

# git hook to run a command after `git pull` if a specified file was changed
# Run `chmod +x post-merge` to make it executable then put it into `.git/hooks/`.
# Or run the following commond in unix-like terminal
# curl -O https://gist.githubusercontent.com/GeekaholicLin/63d03a960eea595e543116dd5de07080/raw/d22bfce02c62e74ebe38e6252c2165061d9aa495/post-merge && chmod +x post-merge && mv post-merge .git/hooks/
changed_files="$(git diff-tree -r --name-only --no-commit-id HEAD^ HEAD)"

check_run() {
	echo "$changed_files" | grep --quiet "$1" && eval "$2"
}

# Example usage
# In this example it's used to run `npm install` if package.json changed
check_run package.json "npm install"