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Top Forums UNIX for Beginners Questions & Answers How to pass ^] character for a script to automate sending commands in my telnet device ? Post 303046039 by v4vivekss on Wednesday 22nd of April 2020 08:41:44 AM
Old 04-22-2020
How to pass ^] character for a script to automate sending commands in my telnet device ?

Hi,

I usually log into my device using
Code:
telnet IP PORT

like this

Code:
[xadmin@x-123-b3 ~]$ telnet 172.5.23.6 50006
Trying 172.5.23.6..
Connected to 172.5.23.6.
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.

Code:
HOST='172.5.23.6 50006'
USER='username'
PASSWD='passwrd'


(
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
Code:
[xadmin@x-123-b3]$ sh telnet.sh
telnet> Trying 172.5.23.6...
Connected to 172.5.23.6.
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.
 

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IGNORE_USER_ABORT(3)							 1						      IGNORE_USER_ABORT(3)

ignore_user_abort - Set whether a client disconnect should abort script execution

SYNOPSIS
int ignore_user_abort ([string $value]) DESCRIPTION
Sets whether a client disconnect should cause a script to be aborted. When running PHP as a command line script, and the script's tty goes away without the script being terminated then the script will die the next time it tries to write anything, unless $value is set to TRUE PARAMETERS
o $value - If set, this function will set the ignore_user_abort ini setting to the given $value. If not, this function will only return the previous setting without changing it. RETURN VALUES
Returns the previous setting, as an integer. EXAMPLES
Example #1 A ignore_user_abort(3) example <?php // Ignore user aborts and allow the script // to run forever ignore_user_abort(true); set_time_limit(0); echo 'Testing connection handling in PHP'; // Run a pointless loop that sometime // hopefully will make us click away from // page or click the "Stop" button. while(1) { // Did the connection fail? if(connection_status() != CONNECTION_NORMAL) { break; } // Sleep for 10 seconds sleep(10); } // If this is reached, then the 'break' // was triggered from inside the while loop // So here we can log, or perform any other tasks // we need without actually being dependent on the // browser. ?> NOTES
PHP will not detect that the user has aborted the connection until an attempt is made to send information to the client. Simply using an echo statement does not guarantee that information is sent, see flush(3). SEE ALSO
connection_aborted(3), connection_status(3), Connection Handling for a complete description of connection handling in PHP. . PHP Documentation Group IGNORE_USER_ABORT(3)
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