If you ever wondering how to upgrade your reverse shell, here is the simple instruction that you can follow:
1. Spawning bash with python: $ python3 -c 'import pty; pty.spawn("/bin/bash")'
2. Backgrounding the remote shell with CTRL-Z: user@remote:~$ ^Z
3. Getting ROWS and COLS within current terminal window: user@local:~$ stty -a | head -n1 | cut -d ';' -f 2-3 | cut -b2- | sed 's/; /\n/'
4. Ignoring hotkeys in the local shell and getting back to the remote: user@local:~$ stty raw -echo; fg
5. Setting correct size for the remote shell: user@remote:~$ stty rows ROWS cols COLS
6. Adding some colors: user@remote:~$ export TERM=xterm-256color
7. Reloading bash to apply the TERM variable: user@remote:~$ exec /bin/bash
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