shadowconfig - turn shadow passwords on

       Turning shadow passwords off using shadowconfig is not supported anymore.

shadowconfigon will turn shadow passwords on.

shadowconfig will print an error message and exit with a nonzero code if it finds anything awry.  If that
       happens,  you  should  correct  the  error  and  run it again.  Turning shadow passwords on when they are
       already on is harmless.

       shadowconfig - turn shadow passwords on

       Read /usr/share/doc/passwd/README.Debian for  a  brief  introduction  to  shadow  passwords  and  related
       features.

Debian shadow-utils                                2025-02-17                                    shadowconfig(8)

shadowconfig