Lecture 11

Question 1

Files and directories are found
through their

Answer 1

path name

Question 2

path name

Answer 2

describe where a particular file or directory can be found

Question 3

two methods of controlling who can access a file and how
they can access it

Answer 3

traditional access permissions and ACLs (Access Control Lists

Question 4

Three types of users can access a file

Answer 4

owner/user, group and other(everyone else)

Question 5

command to see permissions for files

Answer 5

ls -l

Question 6

chmod access for all users

Answer 6

a

Question 7

chmod access for group

Answer 7

g

Question 8

chmod access for other

Answer 8

o

Question 9

chmod access for user

Answer 9

u

Question 10

adding r and removing rx chmod access respectively

Answer 10

+r and -rx

Question 11

chmod numeric arguments: absolute or relative

Answer 11

absolute

Question 12

chmod Octal 2: Binary and Permission

Answer 12

010: -w-

Question 13

chmod Octal 1: Binary and Permission

Answer 13

001: –x

Question 14

chmod Octal 3: Binary and Permission

Answer 14

011: -wx

Question 15

chmod Octal 4: Binary and Permission

Answer 15

100: r–

Question 16

chmod Octal 5: Binary and Permission

Answer 16

101: r-x

Question 17

chmod Octal 6: Binary and Permission

Answer 17

110: rw-

Question 18

chmod Octal 7: Binary and Permission

Answer 18

111: rwx

Question 19

pointer to a file

Answer 19

file link

Question 20

command for hard link

Answer 20

ln

Question 21

command for symbolic link

Answer 21

ln -s

Question 22

difference between hard link and sym link

Answer 22

hard link:
- direct pointer to file
- You can create a hard link to a file only from within the filesystem that holds the
file.
- You cannot create a hard link to a directory
Sym link:
- Indirect pointer to file, a pointer to the hard link to the file
- You can create a symbolic link to a directory
- A symbolic link can point to any file, even one on a different filesystem and to nonexistent files

Question 23

List directory contents

Answer 23

ls

Question 24

Create directory

Answer 24

mkdir

Question 25

Remove an empty directory

Answer 25

rmdir

Question 26

Copy files

Answer 26

cp

Question 27

Move or rename files

Answer 27

mv

Question 28

Delete files/directories

Answer 28

rm

Question 29

delete non-emtpy directories

Answer 29

rm -r

Question 30

Create links between files

Answer 30

ln

Question 31

determine file type

Answer 31

file

Question 32

display file status

Answer 32

stat

Question 33

Change access permition

Answer 33

chmod

Question 34

Change group of file/dir

Answer 34

chgrp

Question 35

Change owner of file/dir (admin only)

Answer 35

chown

Question 36

the execution of a command by the Linux kernel

Answer 36

a process

Question 37

Each Process in the system has a unique

Answer 37

PID ( Process Id) number

Question 38

system call

Answer 38

the operating system rountine

Question 39

fork()

Answer 39

causes a process to split in two, parent and child

Question 40

what is the position of init daemon

Answer 40

PID number 1, similar to root dir in file structure and is the ancestor of all processes

Question 41

After the user logs in, what process becomes the user's shell process

Answer 41

login

Question 42

exec()

Answer 42

causes a process's image (the entire memory layout) to be replaced by that of a different executable file

Question 43

In a linux system, 3 utilities lists the users currently logged on?

Answer 43

who, finger and w

Question 44

You can send messaged to users using what command?

Answer 44

write

Question 45

to block messages

Answer 45

mesg n

Question 46

to re-enable blocked messages?

Answer 46

mesg y