OS515-Week5_Lecture

Question 1

See slide two for the…?

Answer 1

Basic anatomy of a regular file.

Question 2

See slide three for the…?

Answer 2

What is an inode.

Question 3

What is the abbreviation and use of Regular File…?

Answer 3

abbreviation : -

Used for storing data.

Question 4

What is the abbreviation and use of Directories…?

Answer 4

abbreviation : d

Used for Organizing files.

Question 5

What is the abbreviation and use of Symbolic Links…?

Answer 5

abbreviation : l

Used for Referring to other files.

Question 6

What is the abbreviation and use of Character Device Nodes…?

Answer 6

abbreviation : c

Used for Accessing devices.

Question 7

What is the abbreviation and use of Block Device Nodes…?

Answer 7

abbreviation : b

Used for Accessing devices.

Question 8

What is the abbreviation and use of Named Pipes…?

Answer 8

abbreviation : p

Used for Interprocess communication.

Question 9

What is the abbreviation and use of Sockets…?

Answer 9

abbreviation : s

Used for Interprocess communication.

Question 10

See Slide 5 for the …?

Answer 10

stat command.

Question 11

Viewing inode information with ls:

what does the -a or –all switch do when used with ls…?

Answer 11

Include files that start with .

Question 12

Viewing inode information with ls:

what does the -d or –directory switch do when used with ls…?

Answer 12

If FILE is a directory, list information about the directory itself, not the directory’s contents.

Question 13

Viewing inode information with ls:

what does the -F or –classify switch do when used with ls…?

Answer 13

Decorate filenames with one of *,/,=,@, or | to indicate file type.

Question 14

Viewing inode information with ls:

what does the -h or –human-readable switch do when used with ls…?

Answer 14

Use “human readable” abbreviations when reporting file lengths.

Question 15

Viewing inode information with ls:

what does the -i or –inode switch do when used with ls…?

Answer 15

List index number of each file’s inode.

Question 16

Viewing inode information with ls:

what does the -l switch do when used with ls…?

Answer 16

Use long listing format.

Question 17

Viewing inode information with ls:

what does the -n or –numeric-uid-gid switch do when used with ls…?

Answer 17

Use numeric UIDs and GIDs, rather then usernames and groupnames.

Question 18

Viewing inode information with ls:

what does the -r or –reverse switch do when used with ls…?

Answer 18

Reverse sorting order

Question 19

Viewing inode information with ls:

what does the -R or –recursive switch do when used with ls…?

Answer 19

List subdirectories recursively.

Question 20

Viewing inode information with ls:

what does the –time=WORD switch do when used with ls…?

Answer 20

Report (or sort by) time specified by WORD instead of mtime. WORD may be one of “atime”, “access”, “ctime”, or “status”.

Question 21

Viewing inode information with ls:

what does the -t switch do when used with ls…?

Answer 21

Sort by modification time.

Question 22

For an example of ls -l see..?

Answer 22

slide 7

Question 23

For directory structure see…?

Answer 23

slide 8

Question 24

For hardlinks see slide…?

Answer 24

9

Question 25

For soft links see slide…?

Answer 25

10

Question 26

Hardlinks cannot…?

Answer 26

hard link directories.

Question 27

Hardlinks have no…?

Answer 27

concept of “original” and “copy”

Question 28

Hard links must…?

Answer 28

refer to files in the same filesystem.

Question 29

Softlinks can….?

Answer 29

Softlink directories.

Question 30

Soft links have a…?

Answer 30

concept of “referrer” and “referred”. Removing the “reffered” file results in a dangling referrer.

Question 31

Soft links may span…?

Answer 31

filesystems (partitions).

Question 32

Linux allows low level access to disk drive through…?

Answer 32

device nodes in the /dev directory. (See slide 12)

Question 33

While devices hold the data they must…?

Answer 33

be prepared and made available. (see slide 13)

Question 34

Filesystems are created with some variant of the…?

Answer 34

mkfs command.

Question 35

The default filesystem of Red Hat Enterprise Linux 5.2 is…?

Answer 35

the ext3 filesystem.

/sbin/mkfs.ext2/dev/fd0

Question 36

The mount command is used to…?

Answer 36

map the root directory of a disk’s (or a disk partition’s) filesystem to an already existing directory. That directory is then referred to as a mount point.

Question 37

The umount command is used to…?

Answer 37

unmount a fileystem from a mount point

Question 38

The df command is used to …?

Answer 38

report filesystem usage, and tables currently mounted devices.

Question 39

Permanent and Temporary Mounts…?

Answer 39

Slide 16 example.

Question 40

By default, only the root user can…?

Answer 40

mount and unmount devices (Console user are the exception).

Question 41

A filesystem can only be unmounted if it is…?

Answer 41

considered “non-busy”

Question 42

The GNOME graphical environment runs an automounter, which …?

Answer 42

keeps an eye on the CD/ROM drive, and will automatically mount the filesystem of any newly inserted disk.

Question 43

In order to improve performance, the kernel buffers all…?

Answer 43

block device (harddrive) interactions so you must umount to ensure these buffers are flushed to disk.

Question 44

Advanced File Commands:

Locate and find…?

Answer 44

Used to locate/find files within the fie system. Locate and find work in different ways.

Question 45

Advanced File Commands:

gzip and bzip2..?

Answer 45

Used to compress/decompress a datastream.

Question 46

Advanced File Commands:

tar…?

Answer 46

Used to create an archive of files (early uses were to archive files to tape), and can be used with zgip/bizp2 to create compressed archives.