OS515_Lecture_4

Question 1

to view permissions from the command line use…?

Answer 1

ls -l

Question 2

(r)ead…?

Answer 2

view the file

Question 3

(w)rite…?

Answer 3

modify the file

Question 4

e(x)ecute…?

Answer 4

use the file as a command.

Question 5

chmod command is used to modify…?

Answer 5

file permissions.

Question 6

The first argument to chmond uses a {ugoa}[+-=]{rwx} syntax to …?

Answer 6

describe how the permissions should be changed.

Question 7

To change the owner of a file use…?

Answer 7

chown.

Question 8

To change the group of a file use…?

Answer 8

chgrp

Question 9

Who can chown or chgrp…?

Answer 9

only the root user can use chown, a user can chgrp a file if they are a member of the group they wish to change the file to.

Question 10

Who can modify file ownerships and permissions…?

Answer 10

chmod - root and the file owner
chgrp - root and the file owner (only to subscribed groups)
chown - only root.

Question 11

How do directories use permissions…?

Answer 11

regular file, uses (r)ead to view the file, (w)rite to modify the file, e(x)ecute to use the file as a command.

Directory, (r)ead to list directory contents, (w)rite add or remove files, and e(x)ecute to “search” for a known file within the directory.

Question 12

The chmod command can use an…?

Answer 12

alternate octal syntax. (The octal syntax is often quicker and more exacting)

Question 13

Linux creates files with a default mode of..?

Answer 13

666 (rw-rw-rw)

Question 14

Linux creates directories with a default mode of…?

Answer 14

777 (rwxrwxrwx)

Question 15

Every process possesses a “umask” parameter which…?

Answer 15

masks out certain of these default permissions.

Question 16

In Read Hat Enterprise Linux, the default umask for standard users is…?

Answer 16

002

Question 17

The bash shell’s umask is modified with the…?

Answer 17

umask command.