Bash

Bash Script Shebang

#!/usr/bin/env bash

Find/Replace in Directory

find ./ -type f -name "*.yml" -exec sed -i s'/thing1/thing2/g' {} \\;

Git Pull in each Sub Dir

for dir in $(ls); do
    if [[ -d $dir ]]; then
        pushd $dir
            git pull --ff-only
        popd
    fi
done

Bundle install if necessary in each sub-dir

for dir in $(ls); do
    if [[ -d $dir ]]; then
        pushd $dir
            [[ -f "./Gemfile" ]] && (bundle check || bundle install)
        popd
    fi
done

pushd/popd - Got to a directory then return to current after

pushd ~/src/some-dir
    rake db:reset
popd

Work in git root dir

pushd $(git rev-parse --show-toplevel)
  echo 'Do work here'
  pwd
popd

Name and Shame for number of open branches

git branch -r | awk -F/ '{print $2}' | sort | uniq -c | sort -k1nr | head

Run last command until it fails

while !!; do :; done

Run a Command for each Installed version of Ruby

for version in $(rbenv versions --bare); do
    rbenv shell $version
    sudo gem update --system
done
rbenv shell --unset

Run rubyfmt on all ruby files

for file in $(find . -type f -name "*.rb"); do rubyfmt "$file" > “${file}.tmp"; mv "${file}.tmp” “$file”; done

Curl that reports failures as an exit code without output

curl -fsL $URL -o /dev/null

Use Previous Arguments

!$ uses the last argument from the previous command

Ex:

mv tmp.log tmp/
ls !$

!* gets ALL the previous args

# Typoed Command name
rpsec ~/some_file_spec.rb ~/other_file_spec.rb
rspec !*

More Ways to grab args

echo !:2 # Grab just the second arg from the last command
echo !1:3 # Grab the first, second and third arg