Bash function for managing remote screen sessions

.bash_profile

# replace all instances of "servername" with the remote host name
# `servername` lists available screen sessions
# `servername <session>` connects to a given session

function servername {
    if [ -n "$1" ]; then
        ssh -t servername "screen -DR $1";
    else
        echo "Usage: servername [environment]";
        echo "Open sessions:"
        ssh -t servername "screen -ls";
    fi
}