Как выполнить команду от root без интерактивного ввода пароля?

IPB:~ mobile$ echo 'test'|read test_var
IPB:~ mobile$ echo $test_var

IPB:~ mobile$ 

(sleep 1; echo alpine) | python -c 'import pty; pty.spawn(["su", "-c", "id"])'

IPB:~ mobile$ python 
-sh: python: command not found
IPB:~ mobile$

$ echo 'test' | { read test_var ; echo $test_var; }
test

$ cat script.sh
#!/usr/bin/expect

spawn /bin/su
expect "Password: "
send "super_password\n"

# Now wait for a prompt and send the command to run
expect "$"
send "whoami\n"
expect "$"
send "exit\n"

(sleep 1; echo alpine) | script -c "su -c id" /dev/null

IPB:~ mobile$ echo alpine | script -c "su -c id"
script: illegal option -- c
usage: script [-akq] [-t time] [file [command ...]]

IPB:~ mobile$ script --help             
script: illegal option -- -
usage: script [-akq] [-t time] [file [command ...]]

(echo su -c id; sleep 1; echo alpine; sleep 1; echo exit) | script

IPB:~ root# apt-get install expect
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Couldn't find package expect
IPB:~ root# aptitude search expect
p   com.hackyouriphone.quitunexpectedly                                                               - be notified when an app has crashed or quit unexpectedly                                                   
p   com.iphonemodding2.thehobbitanunexpectedjourney                                                   - The Hobbit - An Unexpected Journey theme.                                                                  
p   com.wrightscs.quitunexpectedly                                                                    - be notified when an app has crashed or quit unexpectedly                                                   
p   repo.biteyourapple.net.quitunexpectedly                                                           - be notified when an app has crashed or quit unexpectedly                                                   
IPB:~ root#