Operation and Maintenance
Linux Operation and Maintenance
Detailed explanation of scenario linux examples
Detailed explanation of scenario linux examples
Scenario linux--How to exit telnet gracefully in a script
Scenario
The telnet command is the user interface of the TELNET protocol. It supports two modes: Command mode and Session Mode. Although telnet supports many commands, in most cases, we just use it to check whether the target host has opened a certain port (default is 23).
There are two execution results:- The port is not open
$ telnet 101.199.97.65 62715
Trying 101.199.97.65... telnet: connect to address 101.199.97.65: Connection refused
- The port is open
$ telnet 101.199.97.65 62715
Trying 101.199.97.65... Connected to 101.199.97.65. Escape character is '^]'.
According to the prompt
Escape character is '^]'.It can be seen that the exit character is '^]' (CTRL+]). Entering other characters at this time will not cause it to exit, nor will CTRL+C. After entering CTRL+], it will be automatically executed and enter the command mode:
^]
telnet>
quit at this time to truly exit.
telnet> quit
Connection closed.
-e:
$ telnet -e p 101.199.97.65 62715 Telnet escape character is 'p'. Trying 101.199.97.65... Connected to 101.199.97.65. Escape character is 'p'. p telnet> quit Connection closed.
- Exit immediately after outputting the results
$ echo "" | telnet 101.199.97.65 62715
Copy after loginCopy after login
Trying 101.199.97.65... Connected to 101.199.97.65. Escape character is '^]'. Connection closed by foreign host.
$ echo "" | telnet 101.199.97.65 62715
Trying 101.199.97.65... telnet: connect to address 101.199.97.65: Connection refused
- Delayed exit after outputting results
sleep 2 causes telnet to output results and stay for 2 seconds before exiting command mode.
$ sleep 2 | telnet 101.199.97.65 62715
Copy after login
Trying 101.199.97.65... Connected to 101.199.97.65. Escape character is '^]'. Connection closed by foreign host.
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