use expect to enter password when need sudo in script

问题

I am using Ubuntu 14.04 and installed expect. I am trying to write a script to enter password when it prompted.
UPDATED Code:

  #!/usr/bin/expect -d
  set timeout 20

  set pw odroid
  spawn sudo apt-get update

  expect {\[sudo]\ password for odroid: }
  send "$pw\r"

  close

Any suggestions? thx

UPDATE Errors:

expect: does "" (spawn_id exp4) match glob pattern "\[sudo]\ password for odroid: "? no
[sudo] password for odroid: 
expect: does "[sudo] password for odroid: " (spawn_id exp4) match glob pattern "\[sudo]\ password for odroid: "? yes
expect: set expect_out(0,string) "[sudo] password for odroid: "
expect: set expect_out(spawn_id) "exp4"
expect: set expect_out(buffer) "[sudo] password for odroid: "
send: sending "odroid\r" to { exp4 }

回答1:

You have too many quotes. Choose one of:

expect {\[sudo\] password for odroid: }
expect "\\\[sudo\\\] password for odroid: "

Clearly the first option is better.

Lots of escaping is necessary because 1) square brackets are special in a glob pattern, and 2) square brackets are special Tcl syntax (command substitution) in double quotes but not in curly braces.

回答2:

A more generic way of solving your issue would be matching on assword

expect "*?assword*"

This allows for a more generic script where the username is irrelevant.

I also had the following issue with the snippet below. Basically $pw gets interpreted by the shell and needs to be set outside the expect TCL code.

pw="Password1234"

expect -f - <<-EOF
  set timeout 10

  spawn sudo mysql_secure_installation
  expect "*?assword*"
  send -- "$pw\r"
  expect eof
EOF

来源：https://stackoverflow.com/questions/38458053/use-expect-to-enter-password-when-need-sudo-in-script

标签

ubuntu-14.04

expect