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rpm --checksig (rpm -K) checks the signature for a package against installed keys (http://www.rpm.org/max-rpm/s1-rpm-checksig-using-rpm-k.html) The man page makes no mention of this. (rpm-4.13.0-0.rc1.11.fc23)
Checking signatures is implemented in rpmkeys command, so "--checksig" is documented in rpmkeys man page. Option "--checksig" is leaved in rpm command only because of backward compatibility but it is deprecated there. Maximum RPM is quite old book (19 years) so not every piece of information from there reflects the current state.
(In reply to Ľuboš Kardoš from comment #1) > Checking signatures is implemented in rpmkeys command, so "--checksig" is > documented in rpmkeys man page. Option "--checksig" is leaved in rpm command > only because of backward compatibility but it is deprecated there. > > Maximum RPM is quite old book (19 years) so not every piece of information > from there reflects the current state. The rpm man page should say all that, so you don't get bug reports like this. Stephen: I suggest reopening this as a documentation bug. You can add the "Documentation" keyword to make that clear: https://bugzilla.redhat.com/describekeywords.cgi
(In reply to Ľuboš Kardoš from comment #1) ... > Option "--checksig" is leaved in rpm command > only because of backward compatibility but it is deprecated there. ... Man pages often document functionality that is provided for backward compatibility. See "man man" for a specific example (-E option). For more examples: $ man -K --regex 1 'backwards?[- ]*compatibility'
Re-opened per #2
To add more weight to Steve's comments, and argue for inclusion of the option (marked as deprecated) in the docs - I only know that this is a deprecated option (and that rpmkeys is probably the right command to use for this instead) because I filed this bug. Had I not, I would just have assumed that the documentation was incomplete, then wondered what had happened if the option went from deprecated to removed. Conversely, with the option documented as deprecated, I would have known to use rpmkeys instead :)
Option got added to new rpm-misc(8) man page. See https://github.com/rpm-software-management/rpm/blob/master/doc/rpm-misc.8