The home directory for lp is /var/spool/lpd.
mail??”User can work with administrative e-mail features. The mail group, for many
Linux systems, has group permissions to use mail files in /var/spool/mail (which is
also often the mail user??™s home directory).
uucp??”User owns various uucp commands (once used as the primary method for dialup
serial communications) as well as log files in /var/log/uucp, spool files in
/var/spool, administrative commands (such as uuchk, uucico, uuconv, and uuxqt)
in /usr/sbin, and user commands (uucp, cu, uuname, uustat, and uux) in
/usr/bin. The home directory for uucp is /var/spool/uucp.
bin??”User owns many commands in /bin in traditional UNIX systems. This is not the
case in some Linux systems (such as Red Hat and Gentoo) because root owns most executable
files. The home directory of bin is /bin.
news??”User could do administration of Internet news services, depending on how you
set permission for /var/spool/news and other news-related resources. The home
directory for news is /etc/news.
By default, the administrative logins in the preceding list are disabled. You would need to change
the default shell from its current setting (usually /sbin/nologin or /bin/false) to a real shell
(typically /bin/bash) to use these.
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