Maintain baseline system security according to organizational policies.

Skill drills that exercise this task

• CSCD240-E1-A-Q11 Change permissions of notes.sh: owner rwx, group rx, other none. Use octal.
• CSCD240-E1-A-Q12 Using only letters, remove write permission from the owner on notes.sh.
• CSCD240-E1-A-Q26 Using absolute path, remove subdirectory scratch under /home/ssteiner. Not in home dir.
• CSCD240-E1-A-Q27 Remove empty subdirectory tmp under /home/ssteiner. You are in home dir.
• CSCD240-E1-A-Q42 Recursively change permissions in current dir so group and other have no write permission.
• CSCD240-E1-B-Q11 Remove setuid bit from /opt/app/runner without changing other permissions.
• CSCD240-E1-B-Q13 Recursively set permissions on ~/secrets/ so only owner has any access.
• CSCD240-E1-C-Q02 After umask 027, a newly-created regular file gets which octal?
• CSCD240-E1-C-Q16 What does the sticky bit on a directory do?
• CSCD240-E1-C-Q22 Set /opt/svc/agent to owner rwx, group rx, other none using octal.
• CSCD240-E1-C-Q23 Remove the setuid bit from /opt/svc/agent using symbolic form, leaving other perms.
• CSCD240-E1-C-Q24 Recursively change perms under ~/secrets so group and other have no access.
• CSCD240-E1-C-Q42 chmod -R 644 /etc/ssh — what broke and why?
• CSCD240-E1-C-Q47 -rw------- on .ssh and drwx------ on .config — which is typical for an SSH private key and why?