Feeding passphase in a script?

[Rihad]

Hi, I need to create a passphrased key in a shell script, and while 
testing it in a console it's still asking for the passphrase. Any way to 
do that easily?

$ echo -e "MyStrongPassword\nMyStrongPassword" | tarsnap-keymgmt 
--outkeyfile outkeyfile -w -r -d --nuke --passphrased keyfile
Please enter passphrase for keyfile encryption: