010-160 File Permissions and Ownership 2

Question 1

What numeric permission value represents rwxr-x---?

Accepted Answer

750

Answer

rwx=7, r-x=5, ---=0, so the octal value is 750.

Question 2

Which command changes the group ownership of a file to 'devs'?

Accepted Answer

Both A and B

Answer

Both 'chgrp devs file.txt' and 'chown :devs file.txt' change only the group ownership.

Question 3

A file has permissions -rw-rw-r--. Which class has write access?

Accepted Answer

Owner and group

Answer

rw- for owner and rw- for group means both owner and group have write access; others have read-only.

Question 4

What does the sticky bit do when set on a directory?

Accepted Answer

Prevents users from deleting files they do not own

Answer

The sticky bit on a directory restricts file deletion so only the file owner, directory owner, or root can remove files.

Question 5

Which symbolic permission argument adds execute permission for all users?

Accepted Answer

a+x

Answer

'a' stands for all (user, group, others), so 'a+x' adds execute for everyone.

(010-160) LPI Linux Essentials Practice Test