how to use su in a shell script? 2

[InigoMontoya]

I have a script that needs to run commands under different users. I thought all I had to do was...
as root...

su - $username0
command
command
exit

su - $username1
command
command
exit

instead of running the scripts inside the new shell it waits until the shell exits then the commands execute.
I need them to execute inside the new shell. Please help...TIA.

 

[pmurray99]

use a here document...

su - $username0 <<EOF
command
command
exit
EOF

 

[usige]

You can also use the -c flag: eg. su - $username0 -c &quot;command;command&quot;

 

[InigoMontoya]

Thanks! both worked. I will use the -c flag since it's similar to expect's -c flag. Can this be done in expect as well? I've tried spawning a su - $username but the same result. It would wait until the session is closed then continue with the commands.

 

[marsd]

Using expect with su is very simple.

set rootprompt "root@.*"
spawn su

     expect {
            -re ".*assw.*" {
             send_user "Need password: "
             set pw [gets stdin]
             send "$pw\r"
             expect -re "$rootprompt" {
                         send_user "Logged in as root\n"
                         send_user "Type \"quit\" to quit\n"
                         interact {
                               "quit" {close $id ; wait}
                         }
              }
              eof {send_user "SU failed\n"}
              timeout {send_user "Timed out!!\n"}
     }