Bash script to delete local git branches that aren't on git remote server

gitprunelocalbranchs.sh

# Nielson Santana @nielsonsantana
# This code is under Criative Communs license [https://creativecommons.org/licenses/by/4.0/]
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


function gitprunelocalbranchs(){
    RED="\e[31m"
    ENDCOLOR="\e[0m"

    git fetch origin -p
    CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
    REMOTE_BRANCHS=$(git branch --list --remotes)

    BRANCHS_TO_DELETE=$(
        git branch --list --format='%(refname:short)' | while read -r line ; do
            result=$(echo $REMOTE_BRANCHS | grep "$line")

            if [ "$result" == "" ] && [ "$CURRENT_BRANCH" != "$line" ]; then
                echo "${line}"
            fi
        done
    )

    echo "This script delete local branchs that aren't on remote repository."
    if [ "$BRANCHS_TO_DELETE" == "" ]; then
        echo "No branchs to delete."
    else
        echo "Branchs to delete:"
        echo -e "${RED}$BRANCHS_TO_DELETE${ENDCOLOR}"

        read -p "Do you want delete these branchs? (y/N)" INPUT_VARIABLE
        
        if [ "$INPUT_VARIABLE" = "y" ]; then

          echo "$BRANCHS_TO_DELETE" | while read -r line ; do
            if [ "$line" != "" ]; then
                git branch -D "$line"
            fi
          done
        fi
    fi
}
gitprunelocalbranchs

Install guide

curl https://gist.githubusercontent.com/nielsonsantana/e717259f0262f8fd7d85d566b1c49323/raw/gitprunelocalbranchs.sh \
--output gitprunelocalbranchs.sh
chmod +x gitprunelocalbranchs.sh
mv gitprunelocalbranchs.sh /usr/local/bin/