$ cat shomei.txt¶
This is a file to be signed.
$ gpg --clearsign shomei.txt¶
$ ls¶
himitsu.txt	himitsu.txt.asc	shomei.txt	shomei.txt.asc
$ cat shomei.txt.asc¶
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

This is a file to be signed.
-----BEGIN PGP SIGNATURE-----

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s4bol6WxZIKJ1YPEJQg4JTYSG0ir30j0d+7MEulVbFwTA4IJqoTyGwCgI/sVCP0b
Lt/TK1Uu
=nUTC
-----END PGP SIGNATURE-----
$