install.sh

#!/bin/bash

if [ ! -d "$HOME/bin/ssh" ]
 then
    [[ -d "$HOME/bin" ]] || mkdir "$HOME/bin"
    cp ./ssh $HOME/bin/ssh
    grep -q -e "alias ssh='~/bin/ssh'" $HOME/.bash_aliases || echo "alias ssh='~/bin/ssh'" >> $HOME/.bash_aliases
fi

ssh.sh

#!/bin/bash

ssh() {
    TMPDIR=~/tmp
    case "$(uname -s)" in
        Linux)
            tmp_fifo=$(mktemp -u --suffix=._ssh_fifo)
            ;;
        Darwin)
            tmp_fifo=$(mktemp -u -t ._ssh_fifo)
            ;;
        *)
            echo 'unsupported OS'
            exit
            ;;
    esac

    # cleanup first
    rm ~/tmp/._ssh_fifo* 2>/dev/null

    mkfifo "$tmp_fifo"
    cat ~/.ssh/config ~/.ssh/config.* >"$tmp_fifo" 2>/dev/null &
    /usr/bin/ssh -F "$tmp_fifo" "$@"
	cat "$tmp_fifo"
#    rm "$tmp_fifo"
}

ssh $*