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Old 05-25-2008, 10:03 PM   #1
LQ Newbie
Registered: Dec 2007
Posts: 2

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Question expect script output

Hello all,

I am afraid I am at a deadend and could really use a helping hand. I have a frankenstein'd expect script that ssh's into a server, changes directory and outputs an 'ls' to a text file. Ideally I want to pass the output to a variable that goes into a larger bash script. Right now the txt file returns the ls command, the output and then the prompt again before exiting. I only want the output obviously. If anyone can lend a hand that would be great. Here's the script:

#!/usr/bin/expect -f
set prompt "((%|#|\\$| :) |>|])$"
 if [info exists env(EXPECT_PROMPT)] {
set prompt $env(EXPECT_PROMPT)
set timeout 5
set user [lindex $argv 0]
#set command [lindex $argv 1]
set host [lindex $argv 1]
set log [open "log.txt" "w"]
if {[llength $argv] != 2} {
   puts stderr "Usage: $argv0 <username> <host>\n"
   exit }
exp_internal 1
send_user "ssh Password: "
set timeout -1
stty -echo
expect_user -re "(.*)\n"
set password $expect_out(1,string)
send_user "\n"

spawn ssh -l $user $host
expect {
 { send -- "yes\r" }
 { send -- "$password\r" }
#expect -timeout 30 -nocase "*assword:"
#send "$password\r"
sleep 5
#expect -re $prompt
send "cd ../../domains\r"
sleep 5
expect -re $prompt
expect "$ "
exp_send "ls\r"
expect "$ "
sleep 5
set outcome $expect_out(buffer)
puts $log $outcome
sleep 5
send "exit\r"
expect eof
Old 05-27-2008, 08:01 AM   #2
Senior Member
Registered: May 2008
Location: planet earth
Distribution: Debian
Posts: 1,732

Rep: Reputation: 50
Uh - what exactly are you trying to accomplish?
Since 'ssh' was intended as a secure replacement for 'rsh', you can use it to execute 'ls' remotely and simply pipe its stdout to a file; no need to 'log' as in your script.

I also question the sanity of invoking ssh with user/password on the line - someone might be spying with ps! Using authentication via the 'known hosts' file (pre-shared keys) is safer - that way someone has to be able to read your private key before they can get into your remote system, rather than simply monitoring you with 'ps' and getting a clear password.


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