Why doesn't it go to background?

Question

linux

If you write something like
md5sum /dev/urandom &
it will immediately go to the background, but if you run the same command on a remote host

expect -c 'spawn ssh -o StrictHostKeyChecking=no -o UserKnowHostFile=/dev/null [email protected] "md5sum /dev/urandom &" expect password; send "12345\n"; interact'

then it will hang, they say, it is being executed ... As if I did not drive it into the background ...

Answer 1

/usr/bin/expect -c '
  spawn ssh -oStrictHostKeyChecking=no [email protected]
  expect "word:"
  send "password\r"
  expect ".*"
  send "md5sum /dev/urandom \&\r"
  expect ".*"
  interact'