View local git branches ahead/behind of main

listBranches.sh

#!/bin/bash
for branch in $(git branch | sed 's/* //'); do 
    ahead=$(git log --oneline main..$branch | wc -l | tr -d ' ');
    behind=$(git log --oneline $branch..main | wc -l | tr -d ' ');
    printf "+%5s, -%5s : %s\n" "$ahead" "$behind" "$branch";
done