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Command Line Interface > Ch.9 Permissions > Flashcards

Ch.9 Permissions Flashcards

1
Q

What does ssh stand for, and what does it allow?

A

Secure Shell. Remote users can log in via ssh and operate the computer if it is attached to a network or the internet.

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2
Q

What does command id do

A

display user identity

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3
Q

what does command chmod do

A

change a file’s mode

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4
Q

what does command umask do

A

set the default file permissions

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5
Q

what does command su do

A

run a shall as another user

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6
Q

what does command sodu do

A

execute a command as another user

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7
Q

what does command chown do

A

change a file’s owner

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8
Q

what does command chgrp do

A

Change a file’s group ownership

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9
Q

what does command passwd do

A

change a user’s password

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10
Q

How are access rights to files and directories defined?

A
  1. read access 2. write access 3. execute access
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11
Q

using ls, what are the first 10 characters of the listing?

A

File attributes

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12
Q

What is the attribute for a regular file

A

-

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13
Q

What is the attribute for a directroy

A

d

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14
Q

what is the attribute for a symbolic link

A

1

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15
Q

what are the attribute for a character special file?

A

c

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16
Q

what is the attribute for a block special file

A

b

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17
Q

What does attribute r allow

A

Allows a file to be opened and read. Allows a directory’s contents to be listed if the execute attribute is also set.

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18
Q

What does attribute w allow?

A 
Allows a file to be written to or
truncated, however this attribute
does not allow files to be
renamed or deleted. The ability
to delete or rename files is
determined by directory
attributes.
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19
Q

What does attribute x allow?

A 
Allows a file to be treated as a
program and executed. Program
files written in scripting
languages must also be set as
readable to be executed.
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20
Q

-rwx——

A

A regular file that is readable, writable, and executable by the
file’s owner. No one else has any access.

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21
Q

-rw——-

A

A regular file that is readable and writable by the file’s owner.
No one else has any access.

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22
Q

-rw-r–r–

A

A regular file that is readable and writable by the file’s owner.
Members of the file’s owner group may read the file. The file is
world-readable

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23
Q

-rwxr-xr-x

A

A regular file that is readable, writable, and executable by the
file’s owner. The file may be read and executed by everybody
else.

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24
Q

-rw-rw—-

A

A regular file that is readable and writable by the file’s owner
and members of the file’s group owner only.

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25
Q

lrwxrwxrwx

A

A symbolic link. All symbolic links have “dummy”
permissions. The real permissions are kept with the actual file
pointed to by the symbolic link.

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26
Q

drwxrwx—

A

A directory. The owner and the members of the owner group
may enter the directory and create, rename and remove files
within the directory.

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27
Q

drwxr-x—

A
  • A directory. The owner may enter the directory and create,
    rename, and delete files within the directory. Members of the
    owner group may enter the directory but cannot create, delete,
    or rename files.
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28
Q

Who are the only entites that can change the mode of a file or directory?

A

file’s owner or superuser

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29
Q

What is octal number representation?

A

Base 8

30
Q

What is hexadecimal number representation?

A

base 16

31
Q

What does binary counting look like?

A

0, 1, 10, 11, 100, 101, 110, 111, 1000, 1001, 1010, 1011…

32
Q

What does octal counting look like?

A

0, 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15, 16, 17, 20, 21…

33
Q

What does hexadecimal counting look like?

A

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10, 11, 12, 13…

34
Q

What is the 0 octal binary?

A

000

35
Q

what is the 1 octal binary

A

001

36
Q

What is the 2 octal binary

A

010

37
Q

what is the 3 octal binary?

A

011

38
Q

what is the 4 octal binary

A

100

39
Q

what is the 5 octal binary

A

101

40
Q

what is the 6 octal binary

A

110

41
Q

what is the 7 octal binary

A

111

42
Q

what file mode is binary 000

A
43
Q

what file mode is binary 001

A

–x

44
Q

what file mode is binary 010

A

-w-

45
Q

what file mode is binary 011

A

-wx

46
Q

what file mode is binary 100

A

r–

47
Q

what file mode is binary 101

A

r-x

48
Q

what file mode is binary 110

A

rw-

49
Q

what file mode is binary 111

A

rwx

50
Q

what octal is file mode —

A

0

51
Q

what octal is file mode –x

A

1

52
Q

what octal is file mode –w-

A

2

53
Q

what octal is file mode -wx

A

3

54
Q

what octal is file mode r–

A

4

55
Q

what octal is file mode r-x

A

5

56
Q

what octal is file mode rw-

A

6

57
Q

what octal is file mode rwx

A

7

58
Q

What are the 5 most commonly used three octal digit arguments?

A

7 (rwx) 6 (rw-) 5 (r-x) 4 (r–) and 0(—)

59
Q

Chmod symbolic notation short for user

A

u

60
Q

chmod symbolic notation for group owner

A

g

61
Q

chmod symbolic notation short for world

A

o

62
Q

chmod symbolic notation short for all

A

a

63
Q

what is assumed if no character is specified for chmod?

A

All

64
Q

Add execute permission for the owner.

A

chmod u+x

65
Q

Remove execture permission from the owner

A

chmod u-x

66
Q

Add execute permission for the owner, group, and world. This is
equivalent to a+x.

A

+x

67
Q

Remove the read and write permissions from anyone besides the
owner and group owner.

A

o-rw

68
Q

Set the group owner and anyone besides the owner to have read and
write permission. If either the group owner or the world previously
had execute permission, it is removed.

A

go=rw

69
Q

Add execute permission for the owner and set the permissions for
the group and others to read and execute. Multiple specifications
may be separated by commas.

A

u+x,go=rx

70
Q

How do you use su to execute a singel command rather than starting a new interactive command?

A

su -c ‘command’

71
Q

To see what privileges are granted by sudo

A

sudo -l

72
Q

The syntax of chown looks like

this:

A

chown [owner][:[group]] file…

Command Line Interface (17 decks)

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