gpg flags & options

`-c`, `--symmetric`

Encrypt a file with a symmetric cipher using a passphrase.

gpg -c secret.txt

Decrypt an encrypted file and output to stdout.

gpg -d secret.txt.gpg

gpg -d secret.txt.gpg > secret.txt

Generate a new public/private key pair interactively.

gpg --gen-key

Import a public or private key from a file.

gpg --import pubkey.asc

Export a public key in binary format.

gpg --export user@example.com > pubkey.gpg

gpg --export -a user@example.com > pubkey.asc

Create a signature for a file.

gpg --sign document.pdf

Verify a signed file's signature.

gpg --verify document.pdf.gpg

gpg --verify signature.sig document.pdf

List all public keys in your keyring.

gpg --list-keys

gpg --list-keys user@example.com

Specify the recipient's key for encryption.

gpg -e -r user@example.com secret.txt

gpg -e -r alice@example.com -r bob@example.com secret.txt

Output in ASCII-armored format instead of binary.

gpg -c -a secret.txt

gpg --export -a user@example.com