Generate a new keypair:
user@tokyo:~$ gpg --gen-key
Export public key:
user@tokyo:~$ gpg --armor --output pubkey.pgp --export my@mail.de
List keys:
user@tokyo:~$ gpg --list-keys
Sign a file:
user@tokyo:~$ gpg --output file.asc --detach-sig file
Verify a file:
user@tokyo:~$ gpg --verify file.sig file
Clearsign a text file:
user@tokyo:~$ gpg --clearsign file.txt
Verify a clearsigned text file:
user@tokyo:~$ gpg --verify file.txt.asc file