The lab creates /root/perm/report.txt (mode 644) and three users with password Lab-Pass-1: tess, and anna and ben for the shared directory. Work as root (sudo -i) unless a task says otherwise, and write answers to the files in /root/lab-answers/.

Tasks

Work out the octal mode for "owner reads and writes, group reads, others nothing", apply it to /root/perm/report.txt, and check with ls -l and stat -c %a. Write the mode to /root/lab-answers/1.
As root, make /srv/test with mode 711 and put a readable file in it. As tess, try ls on the directory and cat on the file by its full path.
Set umask 077, create a file /root/perm/f077 and a directory /root/perm/d077, and check their modes. Do the same with umask 033 for /root/perm/f033 and /root/perm/d033.
Build the shared /srv/web directory from the chapter for group web, with anna and ben as members. With chmod 2770 and umask 002, show that each user's new files get the web group and that the other user can add to them (echo more >> file). Then chmod 3770 and show that neither can delete the other's files.
List the setuid and setgid programs on your system with find, and write the list to /root/lab-answers/5.

Hints

r is 4, w 2, x 1; chmod, stat -c %a.
mkdir -m 711; su - tess (or sudo -u tess); ls /srv/test and cat /srv/test/FILE.
umask only affects the current shell; new files start from 666 and directories from 777.
groupadd web, usermod -aG web anna; chgrp, chmod. Group membership counts from the next login. As each user, umask 002 before creating a file.
find / -xdev -type f -perm /6000.