This command works:
gpg --sign --encrypt-files file1.txt
But this one doesn't:
gpg --sign --encrypt-files file1.txt file2.txt
Error (IMHO line gpg.c:3442):
usage: gpg [options] --sign --encrypt [filename]
No clues about "sign" and "multifile" incompatibility in gpg manual. The issue
could be fixed in implementing a similar function like "encode_crypt_files" but
with "sign_file".
From the manual:
--multifile
This modifies certain other commands to accept multiple files for processing on the command line or read from stdin with each filename on a separate line. This
allows for many files to be processed
at once. --multifile may currently be used along with --verify,
--encrypt, and --decrypt. Note that
--multifile --verify may not be used with detached signatures.
If we use "--multifile --sign", we got an error message:
gpg: --sign does not yet work with --multifile
A similar message can't be affected with "--multifile --sign --encrypt" ?
Fixed in 6897bbf.
$ gpg2 --multifile --sign --encrypt-files /tmp/foo /tmp/bar
gpg: NOTE: THIS IS A DEVELOPMENT VERSION!
gpg: It is only intended for test purposes and should NOT be
gpg: used in a production environment or with production keys!
gpg: --sign --encrypt does not yet work with --multifile