Visit Our UNIX and Linux User Community


How to break out of hung or waiting telnet session in shell script?


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting How to break out of hung or waiting telnet session in shell script?
# 1  
Old 01-03-2018
How to break out of hung or waiting telnet session in shell script?

I have to put together telnet instructions for 100s of hosts for verifying basic connectivity and get output in a neat format.

Problem- If a telnet is hung with message "Trying .... <hostname" due to firewall or routing issue the commands waits for a very long time before it times out and my shell script gets to execute next command. Please advise how to breakout of such hung telnet and resume on next line.

Last edited by Scott; 01-03-2018 at 07:31 AM.. Reason: Removed Poll
# 2  
Old 01-03-2018
Code:
timeout 1s telnet blah blah

# 3  
Old 01-03-2018
rdrtx1's answer is correct and useful for linux. If you don't have linux please let us know what UNIX and version you do have.

Previous Thread | Next Thread
Test Your Knowledge in Computers #746
Difficulty: Medium
The Z80 is an 8-bit microprocessor introduced by Zilog.
True or False?

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Waiting for a process to complete in shell script

Hi, I need to initiate a process script which will start and do some processing and then shuts down. Then i need to other verifications. But the the process takes around 25 to 3o minutes. One thing i can monitor the nohup.out file for this process where i can wait for shutting down statement to... (3 Replies)
Discussion started by: Prashanth19
3 Replies

2. Shell Programming and Scripting

Unable to close telnet session from script

Hello people, I am creating a script that will alert me in an ftp or telnet account on my system expires. FTP part is ok, but when I am entering the 3 script, it stucks. I can see that the script will not close the telnet seession. Can you please check and let me know what I am doing wrong? What if... (7 Replies)
Discussion started by: drbiloukos
7 Replies

3. Shell Programming and Scripting

Expect script to automate telnet session

Hi all, I am currently running a daemon which creates a virtual terminal for testing purposes. Essentially, if I were to interact with it manually, this is what I get. john@test1:~$telnet localhost 7777 Trying ::1... Connected to localhost. Escape character is '^]' mip6d> pl eth2... (6 Replies)
Discussion started by: abxccd
6 Replies

4. Shell Programming and Scripting

SQL PLUS Command 'ACCEPT' is not waiting for user input with sh shell script

Dear All, The sqlplus 'Accept' command is not waiting for user input when I include the command within a shell script. Note: The 'Accept' command is working fine if I execute it in a SQLPLUS Prompt. Please fins the below sample script which i tried. SCRIPT: -------- #!... (4 Replies)
Discussion started by: little_wonder
4 Replies

5. HP-UX

ssh session getting hung (smilar to hpux telnet session is getting hung after about 15 minutes)

Our network administrators implemented some sort of check to kill idle sessions and now burden is on us to run some sort of keep alive. Client based keep alive doesn't do a very good job. I have same issue with ssh. Does solution 2 provided above apply for ssh sessions also? (1 Reply)
Discussion started by: yoda9691
1 Replies

6. HP-UX

hpux telnet session is getting hung after about 15 minutes

Hi All, Our server OS info: HPUX-UNIX>uname -a HP-UX hps B.11.11 U 9000/800 2983362429 unlimited-user license We access our server from Windows m/c through telnet sessions. But for unknown reason any telnet sessions are getting hung after about 15 minutes idle time. Then we close it and... (2 Replies)
Discussion started by: mhbd
2 Replies

7. Shell Programming and Scripting

closing a telnet session on error, in a shell script

I am using a shell script to telnet into a remote unix server and execute certain commands. But if any command being executed remotely, throws an error, the script just hangs. And the telnet session does not get closed. I want to be able to close the session and complete the script execution in... (1 Reply)
Discussion started by: farahzaiba
1 Replies

8. UNIX for Dummies Questions & Answers

Unix Telnet session

Hi Is there any way whilst in a telnet session you can view your client machine name that you are using to connect to the Unix box ? :eek: (2 Replies)
Discussion started by: mlucas
2 Replies

9. Shell Programming and Scripting

Telnet Session

{ sleep 2 echo "$user" sleep 2 echo "$password" sleep 2 echo " ls" sleep 10 echo "exit" }| telnet $server I have a machine x and i have executed the above script on machine 'x'. i entered the... (6 Replies)
Discussion started by: pathanjalireddy
6 Replies

Featured Tech Videos