Put empty password in comand line?

[juanm4]

Hi, I want to put a empty password through command line, using -p options as below:

java -jar PortableSigner.jar -n -t source.pdf -o out.pdf -s crt.p12 -p ""

After execute this command, the prompt always ask for a password, and if push Enter, the command works.

The problem is that I want to execute all in one command, but I don't know how put empty string in -p option.

Someone can help me?

Thanks