Running a shell script from anywhere in a Git repo

example.sh

#!/bin/sh

# This can be run from anywhere within the repo.

set -eu

# This is the trick
repo_root=$(git rev-parse --show-toplevel)

# Now that we have the absolute path to the repo root, we can just use it
# in the rest of the script -- no need to worry about relative paths, or
# about whether they’re relative to the user’s cwd or to the location of
# the script file or whatever:
some_path="$repo_root/some/path/to/something/from/the/root"