%general-entities; ]> ${LFS}/etc/passwd ${LFS}/etc/group ${LFS}/var/run/utmp ${LFS}/var/log/btmp ${LFS}/var/log/lastlog ${LFS}/var/log/wtmp In order for user root to be able to login and for the name root to be recognized, there must be relevant entries in the ${LFS}/etc/passwd and ${LFS}/etc/group files. Create the ${LFS}/etc/passwd file by running the following command: cat > ${LFS}/etc/passwd << "EOF" root::0:0:root:/root:/bin/bash bin:x:1:1:bin:/bin:/bin/false daemon:x:2:2:daemon:/sbin:/bin/false adm:x:3:4:adm:/var/adm:/bin/false sync:x:5:0:sync:/sbin:/bin/sync shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown halt:x:7:0:halt:/sbin:/sbin/halt lp:x:10:18:lp:/var/spool/lp:/bin/false mail:x:30:30:mail:/var/spool/mail:/bin/false news:x:31:31:news:/var/spool/news:/bin/false uucp:x:32:32:uucp:/var/spool/uucp:/bin/false operator:x:50:0:operator:/root:/bin/bash postmaster:x:51:30:postmaster:/var/spool/mail:/bin/false nobody:x:65534:65534:nobody:/:/bin/false EOF The actual password for root (the x used here is just a placeholder) will be set later. Create the ${LFS}/etc/group file by running the following command: cat > ${LFS}/etc/group << "EOF" root::0:root bin::1:root,bin,daemon daemon::2:root,bin,daemon sys::3:root,bin,adm adm::4:root,adm,daemon kmem::5: utmp::6: tty::10: video::11:root console::12: disk::13:root,adm floppy::14:root cdrom::15: cdrw::16: tape::17:root lp::18:lp usb::19: audio::20: dialout::21:root mail::30:mail news::31:news uucp::32:uucp users::100: nogroup::65533: nobody::65534: EOF The created groups are not part of any standard—they are groups decided on in part by the requirements of the Udev configuration in the final system, and in part by common convention employed by a number of existing Linux distributions. The Linux Standard Base (LSB, available at ) recommends only that, besides the group root with a Group ID (GID) of 0, a group bin with a GID of 1 be present. All other group names and GIDs can be chosen freely by the system administrator since well-written programs do not depend on GID numbers, but rather use the group's name. The login, agetty, and init programs (and others) use a number of log files to record information such as who was logged into the system and when. However, these programs will not write to the log files if they do not already exist. Initialize the log files and give them proper permissions: touch ${LFS}/var/run/utmp ${LFS}/var/log/{btmp,lastlog,wtmp} chmod 664 ${LFS}/var/run/utmp ${LFS}/var/log/lastlog chmod 600 ${LFS}/var/log/btmp The ${LFS}/var/run/utmp file records the users that are currently logged in. The ${LFS}/var/log/wtmp file records all logins and logouts. The ${LFS}/var/log/lastlog file records when each user last logged in. The ${LFS}/var/log/btmp file records the bad login attempts.