[dm-crypt] Reading the passphrase from a key-file

Hello,

today I have another question regading the key-file option. I am 
scripting something where the passphare is given by STDIN, with the 
following options:

cryptsetup luksOpen /dev/sde hdd --header header.img --key-file -

If I enter this line on a command line it prompts me with "Enter 
passphrase for /dev/sde", I was suspecting nothing. How can I make sure 
that the passphrase is being read form STDIN?

Thank  You!

Best Regards,
Volker



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