Control access to files-ch7

Question 1

What does this command do $ ls -l file ?

Answer 1

shows detailed information about permissions and ownership

Question 2

What’s the output of
$ ls -l file ?

Answer 2

-rw-rw-r–. 1 student student 0 Mar 8 17:36 file

Question 3

What does this command do $ ls -ld /home ?

Answer 3

shows detailed information about a directory itself, and not its contents.

Question 4

What’s the output of $ ls -ld /home ?

Answer 4

drwxr-xr-x. 5 root root 4096 Feb 31 22:00 /home

Question 5

What type of file is l ?

Answer 5

symbolic link

Question 6

What type of file is c ?

Answer 6

character device file

Question 7

What type of file is b ?

Answer 7

block device file

Question 8

What type of file is p ?

Answer 8

named pipe file

Question 9

What type of file is s ?

Answer 9

local socket file

Question 10

What’s chmod command used for ?

Answer 10

changes file and directory permissions from the command line

Question 11

What does this command do “$ chmod go-rw document.pdf” ?

Answer 11

Remove read and write permission for group and other on the document.pdf file

Question 12

$ chmod a+x myscript.sh

Answer 12

Add execute permission for everyone on the myscript.sh file

Question 13

$ chown

Answer 13

change owner,change file ownership

Question 14

Setting Special Permissions : setuid

Answer 14

u+s

Question 15

Setting Special Permissions : setgid

Answer 15

g+s

Question 16

Setting Special Permissions : sticky

Answer 16

o+t

Question 17

umask stands for ?

Answer 17

user file-creation mask

Question 18

File’s initial octal permissions

Answer 18

0666 (-rw-rw-rw-)

Question 19

Directory’s initial octal permissions

Answer 19

0777 (drwxrwxrwx)

Question 20

$ umask

Answer 20

displays the current value of the shell’s umask

Question 21

How to change the initial permissions ?

Answer 21

Use the umask command with a single octal argument