This is a new command for [gg-core](https://github.com/fidian/gg-core), the tech behind [gg](https://github.com/fidian/gg). This adds the ability to switch all projects to master if possible.

gg-core-master-command.sh

#!/usr/bin/env bash

commandAdd master cmdMaster

cmdMasterHelp() {
    cat <<EOF
   master          Switches all repos to be on the master branch
EOF
}


# Get a status of the project
cmdMaster() {
    projectForEach cmdMasterEach
}


# Called for each project.  Checks out the master branch.
#
# $1 - Project identifier.
#
# Always returns true.  Can never fail.
cmdMasterEach() {
    local path masterResult

    path="$(getProjectConfig "$1" path)"

    if [[ -z "$path" ]]; then
        status "$1: No path set."

        return 0
    fi

    if [[ ! -d "$path" ]]; then
        status "$1: Not checked out."

        return 0
    fi

    masterResult=$(cd "$path" ; git checkout master)

    if echo "$masterResult" | grep -q "^nothing to commit, working directory clean$"; then
        status "$1: clean"
    else
        status "$1: dirty"
        echo "$masterResult"
    fi
}