Look for any git repos in the current directory, and run `hub sync` in each one.

recurse-sync.sh

#!/usr/bin/env bash

set -e

# Ensure we have the `hub` command available.
if ! [[ -x "$(command -v hub)" ]]; then
    echo "Error: 'hub' is required"
    exit 1
fi

# Loop through all subdirectories of the current directory that are Git repos
for gitDir in $(ls -d ./*/.git)
do
    parent=$(echo ${gitDir} | sed -E 's/\/.git\/?//')
    echo "running hub sync: hub --git-dir='${gitDir}' --work-tree='${parent}' sync"
    hub --git-dir="${gitDir}" --work-tree="${parent}" sync
done