Auto exit Telnet command back to prompt without human intervention ^] quit close exit code 1

Question

I\'m running telnet command on a host for a given port (which is open), it returns 0 (success).

For trying telnet manually, I type the following comman

Answer 1

╭─ ~
╰» echo "^]close^M" | telnet localhost 22; echo $?
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.

telnet> close
Connection closed.
0

To enter the ^] and ^M characters, press ctrl+v ctrt+] and ctrl+v ctrl+m respectively.