Renames the current branch and locally and on remote. (gitrenamebransh.sh <remote_name> <old_branch_name> <new_branch_name>)

gitrenamebranch.sh

#!/bin/sh

# Calling this script:
# gitrenamebransh.sh <remote_name> <old_branch_name> <new_branch_name>

# Rename the local branch to the new name
git branch -m $2 $3

# Delete the old branch on remote - where <remote> is, for example, origin
git push $1 --delete $2

# Push the new branch to remote
git push $1 $2

# Reset the upstream branch for the new_name local branch
git push $1 -u $2

Source: https://stackoverflow.com/questions/30590083/how-do-i-rename-both-a-git-local-and-remote-branch-name?answertab=votes#tab-top