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Documentation for packages, which contain /usr/share/doc/pkexec:
Description: run commands as another user with polkit authorization
polkit is an application-level toolkit for defining and handling the policy
that allows unprivileged processes to speak to privileged processes.
It was previously named PolicyKit.
pkexec is a setuid program to allow certain users to run commands as
root or as a different user, similar to sudo. Unlike sudo, it carries
out authentication and authorization by sending a request to polkit,
so it uses desktop environments' familiar prompting mechanisms for
authentication and uses polkit policies for authorization decisions.
By default, members of the 'sudo' Unix group can use pkexec to run any
command after authenticating. The authorization rules can be changed by
the local system administrator.
If this functionality is not required, removing the pkexec package will
reduce security risk by removing a setuid program.
Homepage: https://www.freedesktop.org/wiki/Software/polkit/
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