14.2 Using GnuPG

File handling:

     $ gpg  [options]  command  [args]
     $ gpg {--armor|-a} {--sign|-s} file # sign file into a text file.asc
     $ gpg --clearsign file              # clear-sign message
     $ gpg --clearsign --not-dash-escaped patchfile  # clear-sign patchfile
     $ gpg --verify file                 # verify clear-signed file
     $ gpg -o file.sig {-b|--detach-sig} file # create detached signature
     $ gpg --verify file.sig file        # verify file with file.sig
     $ gpg -o crypt_file {--recipient|-r} name {--encrypt|-e} file 
             # public-key encryption intended for name
     $ gpg -o crypt_file {--symmetric|-c} file # symmetric encryption
     $ gpg -o file --decrypt crypt_file  # decryption