I can’t find anything in the documentation about this (encryption yes, decryption no).
The line I was given by someone already using this software (he’s actually encrypting what I’m decrypting) is:
gpg --passphrase-fd 0 --decrypt-file C:\temp\REDEMPTION_TC_20110119.txt.pgp < C:\temp\passphrase.txt
Where passphrase.txt contains the passphrase. Unfortunately this fails with the message:
gpg: encrypted with RSA key, ID 88BD0CC6
gpg: decryption failed: No secret key
So I’m at a loss.