For the record,
It seems we've missed investigating the actual '/usr/bin/login' binary
until now. I've quickly looked at it and there's one (documented)
difference spotted:
* the util-linux version does not support the -r flag.
Here's the what login(1) manpage in util-linux says about it:
[...]
BUGS
The undocumented BSD -r option is not supported. This may be required
by some rlogind(8) programs.
[...]
Here's what the shadow login(1) manpage has to say about it:
[...]
SYNOPSIS
[...]
login [-p] -r host
[...]
OPTIONS
[...]
-r
Perform autologin protocol for rlogin.
The -r, -h and -f options are only used when login is invoked by root.
[...]
Question remains how widely used this feature is? Can we drop it?
Regards,
Andreas Henriksson
