GPG
From Wiki.mattrude.com
Note: This Page was written with Fedora 8, 9, & 10 in mind, and may not have been tested on any other versions.
GPG Command Line Program
Encrypting a File
gpg -e -r <Key-ID> <File-Name>
Signing a File
gpg -s -r <Key-ID> <File-Name>
Encrypting & Signing a File
gpg -es -r <Key-ID> <File-Name>
Verifying a Signature
gpg --verify <File-Name>
Decrypting a File
gpg -d <File-Name>
Signing a Key Locally
gpg --lsign-key <Key-ID>
Refresh Public Keys from Key Servers
gpg --refresh-keys
Importing a Public Key from a File
gpg --import <Key-ID>
Importing a Public Key from a Key Server
gpg --search-keys [<Key-ID> OR <Email Address>]
Setting Trust Level on a Key
gpg --edit-key <Key-ID>
Command> trust
1 = I don't know or won't say
2 = I do NOT trust
3 = I trust marginally
4 = I trust fully
5 = I trust ultimately
m = back to the main menu
Your decision? 5
Do you really want to set this key to ultimate trust? (y/N) y
Command> save
gpg --update-trustdb
Creating a new Private Key
gpg --gen-key
