How can I account for connection failure using expect for ssh log-on automation?

The answer is to expect the timeout keyword. If none of the patterns match, then the timeout condition occurs -- of course, you can't set the timeout value to -1: set it to a reasonable number of seconds.

Up vote 0 down vote favorite share g+ share fb share tw.

I have a shell script that works fairly well for automating my ssh connections and for anything else that I would like to do via ssh. I'm very unsatisfied with the results, however, when host can't be found or if connection is refused. If the host cannot be found, upon timeout send prints my password onto the screen... no good.

I've gotten around this by adding an infinite timeout . When connection is refused; however, I get a message about how connection was refused and that there was an error sending, etc... and my password is printed as well. Is there a way to tell my script that if exact expect is not met then don't proceed to send, to just ctrl+c?

The following is the relevant part of my shell script: (used in bash, by the way) Thanks in advance. Expect -c " spawn ssh $USER@$HOST expect -exact \"$USER@$HOST's password:\" send \"$PASS\r\" interact" ssh expect link|improve this question asked Jun 14 '11 at 4:18MindIsMatter11.

The answer is to expect the timeout keyword. If none of the patterns match, then the timeout condition occurs -- of course, you can't set the timeout value to -1: set it to a reasonable number of seconds. Instead of cramming a large-ish script into the -c argument, put it into a file #!

/usr/local/bin/expect -f set host lindex $argv 0 set user lindex $argv 1 set password lindex $argv 2 # or, foreach {host user password} $argv {break} spawn ssh $user@$host expect { -re {password: $} {send "$password\r"} timeout {error "ssh connection timed out! "} } interact.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.