filidorwiese

git_current_branch () {
        local ref
        ref=$(command git symbolic-ref --quiet HEAD 2> /dev/null) 
        local ret=$? 
        if [[ $ret != 0 ]]
        then
                [[ $ret == 128 ]] && return
                ref=$(command git rev-parse --short HEAD 2> /dev/null)  || return
        fi
        echo ${ref#refs/heads/}

npearce

UPDATE (March 2020, thanks @ic): I don't know the exact AMI version but yum install docker now works on the latest Amazon Linux 2. The instructions below may still be relevant depending on the vintage AMI you are using.

Amazon changed the install in Linux 2. One no-longer using 'yum' See: https://aws.amazon.com/amazon-linux-2/release-notes/

Docker CE Install

sudo amazon-linux-extras install docker
sudo service docker start