$ cat config.exp 

#!/usr/bin/expect

set timeout 30

set host [lindex $argv 0]

set password [lindex $argv 1]

set done 0

 

log_file $host.log

spawn telnet $host

expect "Password:"

send "$password\r"

expect "*>"

send "enable\r"

expect "Password: "

send "$password\r"

expect "*#"

send "show running-config\r"

 

while {$done == 0} {

expect {

" --More--" { send -- " " }

"*#" { set done 1 }

eof { set done 1 }

}

}

 

send "\r"

expect "*#"

send "exit\r"

expect eof

exit

 

 

$ cat loop.sh 

#! /bin/sh

while read sw

do

./config.exp $sw

done <<EOF

172.10.0.20 chen

172.10.0.21 chen

172.10.0.22 chen

172.10.0.23 chen

172.10.0.25 chen

172.10.0.26 chen

EOF

$ chmod +x config.exp loop.sh

$ ./loop.sh