How to use `expect` with `zipcloak`?

I create a zip file using zip which includes several files and directories, named test.upd. Now I want to use expect to automatically handle the password encryption. Here are two bash scripts, both do not work:

!/bin/bashMYPWD="mypassword"expect -c '    spawn zipcloak test.upd    expect {"*Enter password*" { send "'"$MYPWD"'\r"                                   exp_continue                                  }"*Verify password*" { send "'"$MYPWD"'\r"                                      exp_continue                                    }    }'

and this file:

!/bin/bashMYPWD="mypassword"expect -c '    spawn zipcloak test.upd    expect "*Enter password*"    send "'"$MYPWD"'\r"    expect "*Verify password*"    send "'"$MYPWD"'\r"    }'

I also tried to create an expect script directly:

#!/usr/bin/expect -fspawn zipcloak test.updexpect "*Enter password*"send "password\r"expect "*Verify password*"send "password\r"

All scripts seem to send correctly the first password request, but it looks like the text for the second password entry is never asked. How can I do it right?

Constraints:

• I have to use zipcloak (NOT zip)
• I want to use expect to automatically set the password.

Remarks:

• I have used the correct script
• Each time, when using the first script, an empty file starting with zi is created in the directory, like ziSvbYhy or zi3gzEQ4.