Shell Programming and Scripting

[noon@node2 ~]$ cat run.exp
#!/usr/bin/expect -f

if { $argc<1 } {
        send_user "usage: $argv0 <passwdfile> \n"
        exit 1 
}
set timeout 20
set passwdfile [ open [lindex $argv 0] ]
catch {spawn -noecho ./myscript.sh}
expect "Password:" {
	while {[gets $passwdfile passwd] >= 0} {
		send "$passwd\r"
		}
}
expect "*]$\ " {send "exit\r"}
close $passwdfile
expect eof
[noon@node2 ~]$ chmod +x run.exp
[noon@node2 ~]$ ./run.exp your_password_file

$
$
$ # contents of myscript.sh
$ cat -n myscript.sh
     1  #!/usr/bin/bash
     2  echo "Printing from myscript.sh"
     3  echo -n "Enter password: "
     4  read passwd
     5  echo
     6  echo "Your password is: $passwd"
     7  echo "End of myscript.sh"
$
$ # run myscript.sh and feed password when prompted
$ ./myscript.sh
Printing from myscript.sh
Enter password: hello_world

Your password is: hello_world
End of myscript.sh
$
$ # now put the password in a file, say "mypasswd.txt"
$ cat -n mypasswd.txt
     1  hello_world
$
$ # and call myscript.sh, redirecting the password from mypasswd.txt
$ ./myscript.sh < mypasswd.txt
Printing from myscript.sh
Enter password:
Your password is: hello_world
End of myscript.sh
$
$

 
$ pbrun commands

 
Password for sara@mydomain