mysqldump: impossible de trouver la table: “|”

J'essaie d'exécuter le fichier exp:

#!/usr/bin/expect

# mysql credentials and connection data
current_db_name='webui_dev'
new_db_name='db_2013'
db_host='localhost'
db_user='root'
db_pass=''


# using a here-document to pass commands to expect. 
# (the commands could be stored in a file as well)
expect <<EOF
  log_user 0
  spawn mysqldump -h "$db_host" -u "$db_user" -p "$current_db_name" | mysql -h "$db_host" -u "$db_user" -p "$new_db_name"
  expect "password:"
  send "$db_pass\r"
  log_user 1
  expect eof
EOF

Je exécuter si avec -f drapeau, et j'obtiens une erreur: mysqldump: Couldn't find table: "|"

si je tente cette approche

exp_internal 1
  spawn sh -c  "mysqldump -h \"$db_host\" -u \"$db_user\" -p \"$current_db_name\" | mysql -h \"$db_host\" -u \"$db_user\" -p \"$new_db_name\" "

Je obtenir un résultat

expect: option requires an argument -- f
usage: expect [-div] [-c cmds] [[-f] cmdfile] [args]
parent: waiting for sync byte
parent: telling child to go ahead
parent: now unsynchronized from child
spawn: returns {81914}

expect: does "" (spawn_id exp7) match glob pattern "password:"? no

expect: does "Enter password: " (spawn_id exp7) match glob pattern "password:"? yes
expect: set expect_out(0,string) "password:"
expect: set expect_out(spawn_id) "exp7"
expect: set expect_out(buffer) "Enter password:"
send: sending "\r" to { exp7 }

Enter password: expect: timed out