For loop not working with Expect script

Mayank_Porwal · 01-28-2016, 01:26 AM

Hi All,
I have written an expect script to login into another server using ssh. But, when I want to do the same for multiple servers using a for loop, it doesnt work.
Below is the script:

#!/usr/bin/expect

match_max 5000
set expect_out(buffer) {}

for i in `cat node_list.txt`
do

node_ip=`echo $i| awk -F"," '{print $1}'`
node_initial_pwd=`echo $i| awk -F"," '{print $2}'`

spawn ssh root@$node_ip

expect {
"*(yes/no)?" {send "yes\r";exp_continue}
"'s password:" {send "$node_initial_pwd\r";exp_continue}
"*current*" {send "$node_initial_pwd\r";exp_continue}
"Enter*" {send "Jan2016!\r";exp_continue}
"Retype*" {send "Jan2016!\r";exp_continue}
"\\\$" { puts "matched prompt"}
}

done
---------
node_list.txt has IP's and passwords separated by a comma(,).
---------
Error I get is this:

mayankp@mayankp:~/scripts/new$ ./connect-to-server.sh
invalid command name "i"
while executing
"i"
("for" initial command)
invoked from within
"for i in `cat node_list.txt`"
(file "./connect-to-server.sh" line 6)

Can you please help me in achieving this?

grail · 01-28-2016, 02:37 AM

I have not used expect very much, but when looking online I found that an expect for loop should look like:

Code:

for {initialization} {conditions} {incrementation or decrementation} {
...
}

# example

for {set i 1} {$i < $no} {incr i 1} {
 set $total [expr $total * $i ]
}

Whereas, what you have written looks like a bash for loop ... are you sure you can mix and match formats in the script?

Mayank_Porwal · 01-28-2016, 03:00 AM

Yes, I think the issue is with mixing of bash for loop and expect for loop.
But, can I call expect script inside a bash script? If yes, that might solve the problem.

grail · 01-28-2016, 03:43 AM

I think so, but we will need an expect guru to pop in to make sure

On the bash side, a for loop and awk are all not needed:

Code:

while IFS=, read -r node_ip node_initial_pwd
do
  ...
done<node_list.txt