How to pass ^] character for a script to automate sending commands in my telnet device ?

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# 1  
Old 04-22-2020
How to pass ^] character for a script to automate sending commands in my telnet device ?


I usually log into my device using
telnet IP PORT

like this

[xadmin@x-123-b3 ~]$ telnet 50006
Connected to
Escape character is '^]'.

Here i press ctrl+] and a 'telnet>' prompt comes up.
Then I send 'send brk' command thus a '?' prompt show up. Here I give the 'login' command and I get "Enter your username " prompt .
Then I use the credentials to log in to the device.

I want to automate the process using a shell script (I dont have permission to install expect on the device )and send a command after logging into the device. I am having trouble sending the ctrl+] using the shell script. Here is my script as of now.

HOST=' 50006'

echo open "$HOST"
sleep 2
echo "^]"
sleep 2
echo "send brk"
sleep 2
echo "login"
sleep 2
echo "$USER"
sleep 2
echo "$PASSWD"
sleep 2
echo "$CMD"
sleep 2
echo "exit"
) | telnet

when i run this i get
[xadmin@x-123-b3]$ sh
telnet> Trying
Connected to
Escape character is '^]'.
Connection closed by foreign host.

I believe the ctrl+] is not going through the script. How can I change the script to perform the above said process? Thanks in advance.
# 2  
Old 04-22-2020
In bash, try
printf "\x1D"

echo $'\035'

# 3  
Old 04-22-2020
In POSIX try:
printf "\035"

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