Listing files that you changed in your current branch

list-git-changed-files.sh

# put here your main branch
MAIN_BRANCH=master

# command to list the files that you changed in your current branch and already commit to that branch
git --no-pager diff --name-only $MAIN_BRANCH

# and command to list the files that you changing right now
git status -s | awk '{if ($1 == "M" || $1 == "??") print $2}'

# execute both commands, concatenate the results and remove the duplicates
( git --no-pager diff --name-only $MAIN_BRANCH; git status -s | awk '{if ($1 == "M" || $1 == "??") print $2}' ) | sort -u

# extra: to pass this files to a command line executable (like RSpec, Reek or Rubocop)
( git --no-pager diff --name-only $MAIN_BRANCH; git status -s | awk '{if ($1 == "M" || $1 == "??") print $2}' ) | sort -u | grep .rb$ | tr '\n' ' ' | xargs bundle exec rubocop

I'm using these commands when I need to test / lint in a large codebase, where the procedures take much time to run.