Expect scripting - extracting userID

Question

I want to get the terminal userID by using whoami command. I have given my script below, but it just returns the command name, instead of username?

How can I get terminal user id using whoami command?

My code is,

send "whoami\r"
      set timeout 5
      expect -re {([a-z]+)} {
       set jobid $expect_out(0,string)
      }
      send_user "\r\nUSER $jobid\r\n"
}

Output for the above code is,

asisdtt-exp7$ whoami
USER whoami
kandabap
asisdtt-exp7$ exit

When I hardcode the first letter of my expected userID (kandabap), I am getting the answer correct. That code is,

send "whoami\r"
      set timeout 5
      expect -re {k([a-z]+)} {
       set jobid $expect_out(0,string)
      }
      send_user "\r\nUSER $jobid\r\n"

Output,

asisdtt-exp7$ whoami
kandabap
asisdtt-exp7$ 
USER kandabap

I am very much confused.

Answer 1

I'm not sure what you're really trying to do, but this will work just fine:

log_user 0
spawn whoami
expect eof
set jobid $expect_out(buffer)
puts "USER $jobid"

Of course, none of that's really needed. You can do the same thing using plain TCL:

puts "USER [exec whoami]"