shell script: send Command to serial console and get result

Question

On my Computer is a Cisco WS-C3550 connected to serial interface, I can connect with following Command to the Device:

cu -l /dev/cuau0 -s 9600

If I connected to the Device i send following command

show interface FastEthernet0/2

And the output of this command I want to use in a shell script to get some values, how can I do this? I use FreeBSD (pfsense 2.0.1) as operating system.

I try anything like

echo 'show interface FastEthernet0/2' > cu -l /dev/cuau0 -s 9600 > test.log

But this dosen't work. I get following error:

Ambiguous output redirect.

could it be echo 'show interface FastEthernet0/2' | cu -l /dev/cuau0 -s 9600 > test.log — Stephane Rouberol
– Stephane Rouberol, Commented Sep 24, 2012 at 10:20
yes it works but now I can't exit from this console, when I insert this command there will be shown a command prompt. If I'am on cu terminal i cant exit with '~.' on a new line. Is it possible to give multiple commands to cu command? — kockiren
– kockiren, Commented Sep 24, 2012 at 13:03

Stephane Rouberol · Accepted Answer · 2012-09-24 13:35:34Z

1

Try:

echo -e 'show interface FastEthernet0/2\n~.' | cu -l /dev/cuau0 -s 9600 > test.log

~. drops the connection see http://www.freebsd.org/cgi/man.cgi?query=cu&sektion=1

answered Sep 24, 2012 at 13:35

Stephane Rouberol

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2 Comments

kockiren Over a year ago

Thx for your answer, but this dosen't work, I will get the prompt after run that command and the content of test.log is 'Connected'

kockiren Over a year ago

See above comment. If I enter this command on prompt, there comes a command prompt in a new line and in the test.log file is following content: 'Connected' thats all

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