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getting remote output with expect
sam.albuquerque
Posts: 13
in Command Line
I'm working some embedded boxes with limited functionality. They run Linux(busybox shell). Its not fullfledged. only some of our custom code..
I need to reboot the box at times or run commands like top on it.
I tried my hands at using expect using simple expect, send, send_user sequences.
However, although I can login to the box, I cannot issue any other command once in.
I've tried to expect " # " thinking that it will wait for the # in the bash prompt and then send a command\r But doesnot help.
Can any one guide where I'm going wrong?
0
Comments
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IF i understood your question, then you need openssh.
openssh has 2 parts: server and client. On the other boxes you have to run the server (make it to run on startup) and from your PC you have to run the client like:
where the IP is the IP of the remote computer, and root is the account you want to login.- ssh root@192.168.1.10
there are great security options for openssh, look at the manual for that.
good luck and i hope you know the base bash commands (otherwise look at the Bash group at the community section).0 -
I agree.
download @ http://www.openssh.org/portable.html if you don't have it
edit: if you're trying to execute a command on multiple machines
there's some neat little for loops you can do with ssh to make that happen
ssh-keygen -t rsa
scp ~/.ssh/id_rsa.pub user@host (for each individual hosts)
ssh into the first machine
cat ~/id_rsa.pub >> ~/.ssh/authorized_keys2
chmod 644 ~/.ssh/authorized_keys2
(do this for each machine)
now make a list on the workstation for each host
hosts.dat
192.168.1.1
192.168.1.2
192.168.1.3 and so on
now,
for i in `cat hosts.dat`; do ssh root@$i commands..; done
I have done this in the past -- It may need some tweaks or may not -- but if it's something that looks like what you want to do, its worth exploring0 -
I know about SSH. and the box in question is not a computer. It is a Set-top-box. Since it is a box with a very limited footprint, SSH cannot be installed on it.
"expect" is what I expect to use over here..
"man 1 expect" for details on the expect interpreter0 -
I did find a solution to my woes. I needed to use the interact command in order to execute the commands in the remote shell.
However now I cannot execute it if it is run from a cron..
nevermind thou, I found another solution to my original problem(which was taking snapshot of the device's memory)0
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