Shell Programming and Scripting

#!/bin/bash
if [ $# -ne 1 ]; then
  echo "one parameter is needed: IP address of gateway"
  exit 1
fi

expect -d -c "
  spawn tftp $1
  expect \"tftp> \";
  send \"get /var/lib/tftpboot/fb0\\n\";
  expect {
    timeout {close; exit 1}
    \"tftp> \";    
  }
  send \"quit\\n\";
  #expect eof;
  close;
 "
echo RESULT_CODE $?

$ ./dw_test.sh 192.168.1.122
expect version 5.43.0
spawn tftp 192.168.1.122
parent: waiting for sync byte
parent: telling child to go ahead
parent: now unsynchronized from child
spawn: returns {1394}

expect: does "" (spawn_id exp6) match glob pattern "tftp> "? no
tftp>
expect: does "tftp> " (spawn_id exp6) match glob pattern "tftp> "? yes
expect: set expect_out(0,string) "tftp> "
expect: set expect_out(spawn_id) "exp6"
expect: set expect_out(buffer) "tftp> "
send: sending "get /var/lib/tftpboot/fb0\n" to { exp6 }

expect: does "" (spawn_id exp6) match glob pattern "tftp> "? no
get /var/lib/tftpboot/fb0

expect: does "get /var/lib/tftpboot/fb0\r\n" (spawn_id exp6) match glob pattern "tftp> "? no

set timeout 60