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monteo7 · #1 (**permalink**) 03-04-2008, 12:31 AM

hello, I'm calling expect from a shell script and am having trouble interacting once connected. The below script autmates the login and after running a command (through ssh), I want to interact and am unable to. Any thoughts would be appreciated. Thanks. And sorry for the long code snippet, but I thought full code would be appreciated.

Quote:

#!/bin/ksh

#int main()
clear
#variables
username=
password=
host=
asRoot=
interactive=
cmd=

until [[ "$username" != "" ]];do
print -n "Enter username: "
read username
done
until [[ "$password" != "" ]];do
print -n "Enter your password: "
stty -echo
read password
done
#return echo to terminal
stty echo
until [[ "$host" != "" ]];do
echo ''
print -n "Enter remote host: "
read host
done
until [[ "$asRoot" = [y/Y/n/N] ]];do
print -n "Do you want to run command as root? [y/n]: "
read asRoot
done
until [[ "$interactive" = [y/Y/n/N] ]];do
print -n "Do you want interact after command completion? [y/n]: "
read interactive
done
until [[ "$cmd" != "" ]];do
print -n "Enter command to execute: "
read cmd
#remove leading/trailing whitespace
cmd=$(echo $cmd|sed -e 's/^ *//g;s/ *$//g')
cmd="\"$cmd\""
done
#display what were doing:
echo "you are running: "
echo ""
echo "Command: $cmd"
echo "As: `if [[ "$asRoot" = [y/Y] ]]; then echo root; else echo $username;fi`"
if [[ "$interactive" = [y/Y] ]]; then echo Interactively;fi
if [[ -e "$serverFile" ]]; then echo "On host(: ";cat $serverFile; else echo "On host: $host";fi
echo ""
print -n "Press enter to continue or ctrl c to exit"
read
prompt="[>/%/#/$]"
echo ""
host=$(echo $host|sed -e 's/^ *//g;s/ *$//g')
if [[ "$asRoot" = [y/Y] ]];then
if [[ "$interactive" != [y/Y] ]]; then
sshcmd="ssh $LOGNAME@$host {sudo su - root -c $cmd}"
exp=$(expect -c "
set timeout 10
match_max 100000
spawn $sshcmd $LOGNAME@$host {sudo su - root -c $cmd}
expect {
stty -echo
"*yes/no*" { send \"yes\r\"; exp_continue }
"*assword:" { send \"$password\r\"; exp_continue }
}
stty echo
exit
")
else
sshcmd="ssh $LOGNAME@$host {sudo su - root -c $cmd}"
exp=$(expect -c "
set timeout 10
match_max 100000
spawn $sshcmd $LOGNAME@$host {sudo su - root -c $cmd}
expect {
stty -echo
"*yes/no*" { send \"yes\r\"; exp_continue }
"*assword:" { send \"$password\r\"; exp_continue }
stty echo
interact
}
stty echo
exit
")
fi #end interactive
else
#running as user, not root
sleep 2
if [[ "$interactive" != [y/Y] ]]; then
exp=$(expect -c "
set timeout 10
match_max 100000
spawn ssh $username@$host $cmd
expect {
stty -echo
"*yes/no*" { send \"yes\r\"; exp_continue }
"*assword:" { send \"$password\r\"; exp_continue }
}
stty echo
exit
")
else
exp=$(expect -c "
set timeout 10
match_max 100000
spawn ssh $username@$host $cmd
expect {
stty -echo
"*yes/no*" { send \"yes\r\"; exp_continue }
"*assword:" { send \"$password\r\"; exp_continue }
}
stty echo
#interact
exit
")
fi #end interactive
fi #end as root
#display to user and log any output except that which expect produces
if [[ "`echo "$exp"|grep -v spawn|grep -v password|grep -v Password|grep -v RSA|grep -v rsa`" = "" ]]; then
echo " $host: unable to connect"
echo "####$host.`date +"%H%M%m%d%y"`####" >> autossh.log
echo " $host: unable to connect" >> autossh.log
else
echo " $host: `echo "$exp"|grep -v spawn|grep -v password|grep -v Password|grep -v RSA|grep -v rsa`"
echo "####$host.`date +"%H%M%m%d%y"`####" >> autossh.log
echo " `echo "$exp"|grep -v spawn|grep -v password|grep -v Password|grep -v RSA|grep -v rsa`" >> autossh.log
fi

monteo7 · #2 (**permalink**) 03-04-2008, 04:42 PM

OK, is my code too long that nobody is answering it or is it that noone knows the answer? In short here's my problem: I don't know how to interact when calling expect through shell script. Please note in this shortened version you will need to change 'someHost' to an actual ip address or host name in order to establish an ssh connection and optionally $LOGNAME to a valid user name (if not on unix).

I'm trying to automate the login only and when a prompt is reached exit login loop and interact with user.

Quote:

#!/bin/ksh
set prompt "(%|#|\\\$) $" # default prompt

expect_output=$(expect -c "
set timeout 10
match_max 100000
spawn ssh $LOGNAME@someHost
expect {
stty -echo
"*yes/no*" { send \"yes\r\"; exp_continue }
"*assword:" { send \"$password\r\"; exp_continue }
$prompt { send \"r\" }
}
stty echo
expect -re $prompt { send \"uname\r\"
interact
exit
}

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