Using GNU grep on Ubuntu in Bash

tldr:

grep -r --include=*.md --include=*.markdown --exclude-dir=node_modules "postgres"
grep -r -o --include=*.md --include=*.markdown --exclude-dir=node_modules "postgres"

I’m on Ubuntu using bash with GNU grep 3.7:

$ grep -V
grep (GNU grep) 3.7
Copyright (C) 2021 Free Software Foundation, Inc.

I wanted to search for anything in files with a .md or a .markdown extension.

The first example produced results like this:

elves/_posts/2023-09-11-postgres.markdown:postgres
elves/_heroku-guide/HerokuDataStarter.md:https://elements.heroku.com/addons/heroku-postgresql
elves/_heroku-guide/HerokuDataStarter.md:heroku addons:create heroku-postgresql:hobby-dev
vendor/bundle/ruby/3.0.0/gems/zeitwerk-2.6.7/README.md:# my_gem/db_adapters/postgresql.rb

The second:

elves/_posts/2023-09-11-postgres.markdown:postgres
elves/_heroku-guide/HerokuDataStarter.md:postgres
elves/_heroku-guide/HerokuDataStarter.md:postgres
vendor/bundle/ruby/3.0.0/gems/zeitwerk-2.6.7/README.md:postgres
vendor/bundle/ruby/3.0.0/gems/eventmachine-1.2.7/docs/GettingStarted.md:postgres
vendor/bundle/ruby/3.0.0/gems/zeitwerk-2.6.6/README.md:postgres

I found something like the following helpful:

#! /bin/bash

GREP='grep -r --include=*.md --include=*.markdown --exclude=bundle.js etc...'

Search in _posts

#!/bin/bash

# Search with wildcard for text in ~/Git/charliecalvert.github.io/elves/_posts

```bash
cd ~/Git/charliecalvert.github.io/elves/_posts
FLAGS='-r -l'
INCLUDE='--include=*.md --include=*.markdown'
EXCLUDE='--exclude=bundle.js --exclude-dir=node_modules --exclude-dir=.git'
grep ${FLAGS} ${INCLUDE} ${EXCLUDE} "$1"