Find all Git repositories recursively and update year in LICENSE if commit was made in current year

update-year-in-licence.sh

#!/bin/bash

current_year=$(date +%Y)

# Find all Git repositories, skipping node_modules directories
find . -type d -name .git -not -path '*/node_modules/*' -print0 | while read -d $'\0' repo; do
    # Go to the repository directory
    cd "${repo%/.git}"

    # Check the year of the last commit
    year=$(git log -1 --format=%cd --date=format:%Y)

    if [ "$year" != "$current_year" ]
    then
        # Last commit was not made in current year, skip this repository
        cd - > /dev/null
        continue
    fi

    if [ ! -f LICENSE ]
    then
        # LICENSE file not found, skip this repository
        cd - > /dev/null
        continue
    fi

    # Update the year in the LICENSE file
    # Replace e.g. "(c) 2019 Wojciech Maj" with "(c) 2019–2023 Wojciech Maj"
    sed -i '' "s/Copyright (c) \([[:digit:]]\{4\}\) /Copyright (c) \1–$current_year /g" LICENSE
    # Replace e.g. "(c) 2019–2022 Wojciech Maj" with "(c) 2019–2023 Wojciech Maj"
    sed -i '' "s/Copyright (c) \([[:digit:]]\{4\}\)\([-–]\)\([[:digit:]]\{4\}\)/Copyright (c) \1\2$current_year/g" LICENSE

    # Commit all updates
    git commit -am "Update year in LICENSE"

    # Push changes to remote
    git push

    # Go back to the previous directory
    cd - > /dev/null
done