Manage File Permissions and Ownershop

Question 1

File Permissions and Ownership

User ID - unique for each user on each system

Answer 1

UID

Question 2

File Permissions and Ownership

Group ID - unique for each group on each system

Answer 2

GID

Question 3

File Permissions and Ownership

set in 3x3 groups for each file and directory

Answer 3

permissions

Question 4

File Permissions and Ownership

set in 3 numbers for each file and directory

Answer 4

permissions

Question 5

permission types

read/write/execute permissions for user, group, and everyone
[owner rwx] [group rwx][everyone rwx]

Answer 5

symbolic permissions

Question 6

permission types

read/write/execute permissions for user, group and everyone
[owner #][group #][everyone #]

Answer 6

numeric permissions

Question 7

permission mapping symbolic

read (view directory contents but not file attributes)

Answer 7

r

Question 8

permission mapping symbolic

write (add, delete files - including ones you do not own if you have write priv on directory)

Answer 8

w

Question 9

permission mapping symbolic

execute - can navigate to the directory [cd]

Answer 9

x

Question 10

permission mapping Numeric

read - view directory contents but not file attributes

Answer 10

4

Question 11

permission mapping Numeric

write - add and delete files including ones you do not own if you have write priv

Answer 11

2

Question 12

permission mapping Numeric

execute - can navigate to directory [cd or changedir]

Answer 12

1

Question 13

symbolic option type

normal file

Answer 13

–

Question 14

symbolic option type

symlink

Answer 14

l

Question 15

symbolic option type

block device like a disk

Answer 15

b

Question 16

symbolic option type

character device

Answer 16

c

Question 17

symbolic option type

directory

Answer 17

d

Question 18

permission hierarchy

if user is owner of file

Answer 18

OWNER permissions apply

Question 19

permission hierarchy

if user is a member of the group owner of the file

Answer 19

GROUP permissions apply

Question 20

permission hierarchy

if else then

Answer 20

EVERYONE permissions apply

Question 21

permission hierarchy

only ONE set of permissions apply and that is the first one that the user

Answer 21

qualifies for

Question 22

permissions

tool used to manipulate the permissions of files or directories

Answer 22

chmod

Question 23

chmod

would set permissions as user read/write/execute, group read/execute and other read/execute

Answer 23

chmod 755 myscript.sh

Question 24

chmod

can use symbolic values one category at a time

Answer 24

u - user
g - group
a - all

Question 25

chmod used to add or remove permission values

Answer 25

+/-

Question 26

chmod can set multiple categories of permissions

Answer 26

user/group/all by inserting a comma between each

Question 27

chmod recursive allows you to apply permissions to an entire directory structure including all other files and directories in it

Answer 27

chmod -R

Question 28

chmod report which files changed

Answer 28

chmod -c

Question 29

chmod show all files

Answer 29

chmod -v

Question 30

chmod change only symbolic links and not the original

Answer 30

chmod -h

Question 31

chmod ignore/don't display error messages

Answer 31

chmod -f

Question 32

special permissions solves problem of each file/directory only being able to belong to a single group at any one time and is useful in collaborative configs where you have users in different groups but some users are members of more than one group

Answer 32

special permissions

Question 33

special permissions first group you are a member of

Answer 33

Primary group

Question 34

special permissions your user account appears in /etc/group

Answer 34

Secondary group

Question 35

special permissions set user ID

Answer 35

SUID

Question 36

special permissions permit a user to access/run a program as if they were the

Answer 36

OWNER

Question 37

special permissions value of SUID permissions

Answer 37

4

Question 38

special permissions symbolic notation

Answer 38

u+s

Question 39

special permissions set Group ID

Answer 39

SGID

Question 40

special permissions SGID provides group ownership of any NEW file created in a directory to the group owner of the directory

Answer 40

when applied to a file, permissions to access run programs as if group owner g+s - symbolic notation

Question 41

special permissions Used to keep users that do not own a file from deleting files in a directory they otherwise have group/all write permissions in (changes the 'write' permission for a directory - delete file can only be done by the owner of the file, the owner of the directory or the root user, even if the user would normally have full write permissions to the directory the files are in)

Answer 41

sticky bit

Question 42

special permissions system wide setting applied to all users unless specified in local user .bashrc

Answer 42

umask /etc/bashrc

Question 43

special permissions set here for indicated user overriding the system setting

Answer 43

~/.bashrc

Question 44

Default (no unmask) permissions files - rw-rw-rw

Answer 44

666

Question 45

Default (no unmask) permissions directories - rwxrwxrwx

Answer 45

777

Question 46

special permissions executing this command will provide current default value for user

Answer 46

umask example - umask (may display - 0022) * for this user, this means * 0 - special permissions are masked - NOTE: will always be 0 (removed) * 0 - user permissions are masked (removed) * 2 - group permissions are masked (removed) * 2 - other permissions are masked (removed)