Decrypting data with GnuPG

Hi, I would like to decrypt data encoded with GnuPG without including the private key passphrase in the command to prevent people from viewing it with "ps". Here is the code I wrote: ==== $command = "/usr/bin/gpg --homedir=/path/to/.gnupg --no-secmem-warning --always-trust --yes --output /path/to/output.txt --decrypt /path/to/testtext.asc"; $passphrase = '***********'; $fp = popen($command, 'w+'); fputs($fp, $passphrase); pclose($fp); print "Done"; exit; ====== I assumed that the fputs() function would write the passphrase at the prompt, but that doesn't seem to be the case - the command does not create the output.txt file when ran by the PHP program (which is running as a CGI under my user BTW) while it works when ran from the shell. Any idea why? Thanks! Pierre-Luc Soucy