Bash script to find a load running ssh-agent authorization sockets

gistfile1.txt

#!/bin/bash
function check_agent_socket() {
    local SOCKET=$1
    SSH_AUTH_SOCK=$SOCKET ssh-add -l 2> /dev/null > /dev/null
    result=$?

    case $result in
    0)
        IDENTITIES=$(SSH_AUTH_SOCK=$SOCKET ssh-add -l 2> /dev/null | awk '{print $3}')
        echo "Socket $SOCKET has $(echo $IDENTITIES | wc -w) loaded identities \"$IDENTITIES\""
        _LIVE_SOCKETS+=($SOCKET)
        ;;
    1)
        echo "Socket $SOCKET is alive, but has no load identities"
        _LIVE_SOCKETS+=($SOCKET)
        ;;
    2)
        echo "Unable to contact agent for $SOCKET, removing"
        rm -rvf $(dirname $SOCKET)
        ;;
    esac
}

function find_ssh_agent_sockets() {
    _SSH_AGENT_SOCKETS=$(find /tmp -maxdepth 1 -user $(whoami) -type d -name ssh* 2> /dev/null | \
        xargs -I {} find {} -name agent.\* 2> /dev/null | \
        grep '\/tmp\/ssh-.*\/agent\..*')
}

function select_ssh_agent_socket() {
    _LIVE_SOCKETS=()
    find_ssh_agent_sockets
    if [ ! -z "$_SSH_AGENT_SOCKETS" ]
    then
        for sock in $_SSH_AGENT_SOCKETS
        do
            check_agent_socket $sock
        done
    fi

    local N_LIVE_SOCKETS=${#_LIVE_SOCKETS[@]}
    local N_LIVE_AGENTS=$(ps | grep [s]sh-agent | wc -l)

    if [ "$N_LIVE_AGENTS" -ne "$N_LIVE_SOCKETS" ]
    then
        echo "WARNING: There are \"$N_LIVE_AGENTS\" live ssh-agent processes, but \"$N_LIVE_SOCKETS\" ssh auth sockets that can be connected"
    fi

    case $N_LIVE_SOCKETS in
    0)
        echo "No running ssh-agent found, launching one"
        eval $(ssh-agent)
        ssh-add -l
        ;;
    1)
        echo "Found a running ssh auth sock"
        export SSH_AUTH_SOCK=${_LIVE_SOCKETS[0]}
        ssh-add -l
        ;;
    *)
        echo -e "\nFound multiple live auth sockets, please choose one:"
        for i in "${!_LIVE_SOCKETS[@]}"
        do
            printf "%s )\t%s\n" "$i" "${_LIVE_SOCKETS[$i]}"
        done
        read USER_SELECTION
        export SSH_AUTH_SOCK=${_LIVE_SOCKETS[$USER_SELECTION]}
        ssh-add -l
        ;;
    esac
}

function main() {
   select_ssh_agent_socket
}

main