quick delete of unused merged local branches
Make sure you are on the main branch
git checkout main
Fetch the latest from the git
git pull --prune
See the list of local git branches
git branch
Delete all local branches that have been merged to main branch
git branch -vv | where {$_ -match '\[origin/.*: gone\]'} | foreach { git branch -d $_.split(" ", [StringSplitOptions]'RemoveEmptyEntries')[0]}
Sometimes it may give you an error that the the branch is not fully merged and you will need to change the -d to a -D
See the list of local git branches that remain
git branch