copeland% gpg -h

gpg (GnuPG) 1.4.1
Copyright (C) 2005 Free Software Foundation, Inc.
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions. See the file COPYING for details.

Home: ~/.gnupg
Supported algorithms:
Pubkey: RSA, RSA-E, RSA-S, ELG-E, DSA
Cipher: IDEA, 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH
Hash: MD5, SHA1, RIPEMD160, SHA256, SHA384, SHA512
Compression: Uncompressed, ZIP, ZLIB, BZIP2

Syntax: gpg [options] [files]
sign, check, encrypt or decrypt
default operation depends on the input data

Commands:
 
 -s, --sign [file]             make a signature
     --clearsign [file]        make a clear text signature
 -b, --detach-sign             make a detached signature
 -e, --encrypt                 encrypt data
 -c, --symmetric               encryption only with symmetric cipher
 -d, --decrypt                 decrypt data (default)
     --verify                  verify a signature
     --list-keys               list keys
     --list-sigs               list keys and signatures
     --check-sigs              list and check key signatures
     --fingerprint             list keys and fingerprints
 -K, --list-secret-keys        list secret keys
     --gen-key                 generate a new key pair
     --delete-keys             remove keys from the public keyring
     --delete-secret-keys      remove keys from the secret keyring
     --sign-key                sign a key
     --lsign-key               sign a key locally
     --edit-key                sign or edit a key
     --gen-revoke              generate a revocation certificate
     --export                  export keys
     --send-keys               export keys to a key server
     --recv-keys               import keys from a key server
     --search-keys             search for keys on a key server
     --refresh-keys            update all keys from a keyserver
     --import                  import/merge keys
     --card-status             print the card status
     --card-edit               change data on a card
     --change-pin              change a card's PIN
     --update-trustdb          update the trust database
     --print-md algo [files]   print message digests

Options:
 
 -a, --armor                   create ascii armored output
 -r, --recipient NAME          encrypt for NAME
 -u, --local-user              use this user-id to sign or decrypt
 -z N                          set compress level N (0 disables)
     --textmode                use canonical text mode
 -o, --output                  use as output file
 -v, --verbose                 verbose
 -n, --dry-run                 do not make any changes
 -i, --interactive             prompt before overwriting
     --openpgp                 use strict OpenPGP behavior
     --pgp2                    generate PGP 2.x compatible messages

(See the man page for a complete listing of all commands and options)

Examples:

 -se -r Bob [file]          sign and encrypt for user Bob
 --clearsign [file]         make a clear text signature
 --detach-sign [file]       make a detached signature
 --list-keys [names]        show keys
 --fingerprint [names]      show fingerprints

Please report bugs to <gnupg-bugs@gnu.org>.

>>copeland% gpg --version

gpg (GnuPG) 1.4.1
Copyright (C) 2005 Free Software Foundation, Inc.
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions. See the file COPYING for details.

Home: ~/.gnupg
Supported algorithms:
Pubkey: RSA, RSA-E, RSA-S, ELG-E, DSA
Cipher: IDEA, 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH
Hash: MD5, SHA1, RIPEMD160, SHA256, SHA384, SHA512
Compression: Uncompressed, ZIP, ZLIB, BZIP2