Intro 6

Question 1

644

Answer 1

user: read/write
group, other: read

used for files

Question 2

600

Answer 2

user: read/write
group, other: none

used for files

Question 3

755

Answer 3

user: read/write/execute
group, other: read/execute

used for directories, programs

Question 4

700

Answer 4

user: read/write/execute
group, other: none

used for directories and programs

Question 5

711

Answer 5

user: read/write/execute:
group, other: execute

used for directories

Question 6

You can list the contents of a directory if it’s readable, but you can only access a file in a directory if the directory is _______.

Answer 6

executable

Question 7

Your system may have links that point to other links, which are called _______.

Answer 7

chained symbolic links

Question 8

Symbolic links can cause headaches when you don’t know that they exist. For example, you could ____

Answer 8

easily edit what you think is a copy of a file, but is actually a symbolic link to the original.

Question 9

Don’t confuse the syntax of symbolic link creation!

Answer 9

ln -s target linkname

not

ln -s linkname target!

Question 10

How do you uncompress file.gz and remove the suffix?

Answer 10

gunzip file.gz

Question 11

How do you compress a file with GNU Zip?

Answer 11

gzip file

Question 12

Unlike the zip programs for other operating systems, gzip does not _______.

Answer 12

create archives of files

Question 13

tar extract mode flag

Answer 13

x

e.g. tar xvf archive.tar

Question 14

When using extract mode, remember that tar does not ______ after extracting its contents

Answer 14

remove the archived .tar file

Question 15

table of contents mode for tar

Answer 15

t

Question 16

When unpacking, consider using the _ option to preserve permissions.

Answer 16

p

Question 17

The p option is the default when working as the superuser. If you’re having trouble with permissions and ownership when unpacking an archive as the superuser, make sure that you _____________. Although you may only want to extract a small part of an archive, _____________, and you must not interrupt the process because _____

Answer 17

are waiting until the command terminates and you get the shell prompt back
tar must run through the whole thing
it sets the permissions only after checking the entire archive

Question 18

What two commands unzip compressed tarballs?

Answer 18

gunzip file.tar.gz

tar xvf file.tar

Question 19

How can you unpack a compressed archive with one line using zcat?

Answer 19

zcat file.tar.gz | tar xvf -

Question 20

What is the zcat command?

Answer 20

The same as gunzip -dc where the -d decompresses and the -c sends the results to standard output

Question 21

What is a .tgz file extension?

Answer 21

The same as a .tar.gz file (it’s meant to fit into FAT (MS-DOS-based) filesystems.

Question 22

____, while marginally slower than gzip, often compacts _____ a little more, and it is therefore increasingly popular in the distribution of source code.

Answer 22

bzip2

text files

Question 23

What is the decompressing program from bzip2?

Answer 23

bunzip2

Question 24

What is the bzip2 compression/decompression option for tar?

Answer 24

j

Question 25

A new compression program named __ is also gaining popularity. The corresponding decompression program is ___.

Answer 25

xz

unxz

Question 26

If you encounter a file that ends in .Z, ____.

Answer 26

you have found a relic created by the compress program, which was once the Unix standard.

Question 27

What are the nine subdirectories of root?

Answer 27

bin
dev
etc
usr
home
lib
sbin
tmp
var

Question 28

What are the two subdirectories of var?

Answer 28

log

tmp

Question 29

What are the six subdirectories of usr?

Answer 29

bin
man
lib
local
sbin
share