Grep on console output


 
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# 1  
Old 08-23-2011
Grep on console output

Hellos!

I want to have a unix script that will run grep on the console output. Here is what my script does:
1. Telnet into a remote server (I have done this part successfully)
2. On successful login, the remote server displays outputs information on the console. I need to run grep on that console output (need help with this)

So, I need a script to run grep on the output appearing on the console.

Any thoughts??

Thanks,
Puneet
# 2  
Old 08-23-2011
Puneet, I am not sure how to do this using telnet. ssh is an option that I can think of. Would you be able use ssh, instead?
# 3  
Old 08-23-2011
Quote:
Originally Posted by puneet1984
Hellos!

I want to have a unix script that will run grep on the console output. Here is what my script does:
1. Telnet into a remote server (I have done this part successfully)
2. On successful login, the remote server displays outputs information on the console. I need to run grep on that console output (need help with this)

So, I need a script to run grep on the output appearing on the console.

Any thoughts??

Thanks,
Puneet
Why telnet and not ssh? ssh is far easier to automate. You could just do ssh username@host command | grep ... and it'd do what you expect.

without ssh, you might have to bodge a monster with expect.
# 4  
Old 08-23-2011
Damnation! I am trying to SSH into the server but the server does not accept SSH, only telnet.

I was checking online and the easier way with telnet would be: once I telnet into the server, the script should direct the console output into a file and grep that file for the info
# 5  
Old 08-23-2011
Puneet, I seem to have more questions than answers, for you. Is rsh or rlogin an option?

Please note that ssh is a preferred way to do these things, as it is more secure. Perhaps, you can suggest it to the SA. Smilie

- GP
# 6  
Old 08-23-2011
if you must use telnet you can automate this with the Expect language.
# 7  
Old 08-24-2011
Good morning GP,

rsh and rlogin are both not an option for me. I talked with the Admin as you suggested. Trouble is that this is for a server which runs the power supply for a switch and only supports telnet.

Cheers,
Puneet

---------- Post updated at 12:50 PM ---------- Previous update was at 12:48 PM ----------

Quote:
Originally Posted by frank_rizzo
if you must use telnet you can automate this with the Expect language.
I did that. However, I am having trouble running an if statement with expect.
https://www.unix.com/shell-programmin...ct-script.html

Any thoughts?
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