This cheat sheet is for gpg2 which is aliased by the gpg command on Ubuntu.

Switch to Pinentry TTY

sudo apt install pinentry-tty
sudo update-alternatives --config pinentry

Source: https://superuser.com/a/1381147

Verify

gpg --verify <File Input>

--verify Assume that the first argument is a signed file or a detached signature and verify it without generating any output. [...]

Source: https://linux.die.net/man/1/gpg

Decrypt

gpg -d <File Input>

-d, --decrypt Decrypt the file given on the command line [...]

Source: https://linux.die.net/man/1/gpg

Use specific user as signer during encrypt or sign

gpg -u <Sender Name> command

-u, --local-user Use name as the key to sign with. [...]

Source: https://linux.die.net/man/1/gpg

Encrypt, Sign and output in ASCII

gpg -esa -r <Receiver Name> <File Input>

-e, --encrypt Encrypt data. This option may be combined with --sign [...]

-s, --sign Make a signature. This command may be combined with --encrypt [...]

-a, --armor Create ASCII armored output. [...]

-r, --recipient Encrypt for user id name. [...]

Source: https://linux.die.net/man/1/gpg

Create document with inline signature (clearsign)

gpg --clearsign <File Input>

--clearsign Make a clear text signature. [...]

Source: https://linux.die.net/man/1/gpg