GPG Passphrase on the command line

[Low, Claudia]

Hi,

  Is there an option, eg. --passphrase, that I can use so that I can
pass the passphrase in the command line when doing a signing, symmetric
encryption or decryption? Without this option, I will be prompted on the
console.
  In my program, I can only use command line to execute the commands. I
am not able to pass in the passphrase from a file (using file
descriptor).
 
  Please kindly help.

  Thanks,
    Claudia