Cool way to use Bash in an SSH proxy if nc (netcat) is not on the remote system, or if the remote host does not support ProxyJump. Use in your ~/.ssh/config file.

ssh_config

Host *
    # Cool one-liner. Use bash to connect to ssh host on port 22 and use shell to read/write data!
    # https://www.commandlinefu.com/commands/view/14406/read-and-write-to-tcp-or-udp-sockets-with-common-bash-tools
    ProxyCommand ssh -q joesmith@remotehost 'host=%h;exec 7<>/dev/tcp/${host}/22; cat <&7 & cat >&7; exec 7>&-'