How to get gpg command output in rails?

[littlemaster]

scenario:
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Need to upload the gpg encrypted file.
Get that file and do decryption and store the output in a file
Then extract that file and get the actual output

Problem:
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If I execute that command via command line, it was executed successfully. But via system command it was not running. The decrypted output will have control character. I think due to that it was not able to write that into a file.

command I used:
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system("gpg --output outfile.tgz --decrypt infile.tgzaa")

After executed the above command, outfile.tgz is creating with zero byte size.

Kindly advise me to achieve this .