Domain 2

Question 1

cat -b

Answer 1

Adds line numbers

Question 2

free

Answer 2

Shows available memory

Question 3

type program-name

Answer 3

Will show programs directory

Question 4

Ctrl z

Answer 4

Suspends running program

Question 5

Bg and fg

Answer 5

Sends a program to background or foreground.

Can also use & e.g. blender&

Question 6

Command history stuff

Answer 6

Ctrl a = beginning of line

Ctrl e = end of line

Delete key = del highlighted char

Ctrl t = move char on the left over one to the right

Question 7

Search man pages

Answer 7

whatis

Man -k
Apropos

Question 8

How to quit less

Answer 8

Q, :q or zz

Question 9

Moving in less

Answer 9

Space bar = down

B = up

Question 10

Wrap a command in terminal

Answer 10

\

Question 11

Linked pages in info

Answer 11

Called nodes

Question 12

find

Answer 12

Find - can search dir for a document that contains a string

find /usr/share/docs -name “password”

Question 13

whereis

Answer 13

Used for finding files in root directories not user directories

Question 14

locate

Answer 14

Searches database of file names

Question 15

Shareable verses unshareable files FHS

Answer 15

Nonshareable files contain system specific information such as config files

shareable files containing data or program binary files

Question 16

/

Answer 16

The root directory

Question 17

/etc

Answer 17

System configuration files

Question 18

/boot

Answer 18

Boot files such as Linux kernel initial RAMdisk

Question 19

/bin

Answer 19

Program files for normal operations

Question 20

/sbin

Answer 20

Program files for normal operations not common

Question 21

/lib

Answer 21

Who is libraries other programs may use

Question 22

/usr

Answer 22

Hold programs and data used for normal system operation but are non-critical for booting system

Question 23

/home

Answer 23

Holds users home directories

Question 24

/root

Answer 24

Root users home directory

Question 25

/var

Answer 25

Holds variable files such as log files

Question 26

/tmp

Answer 26

Holes temporary files

Question 27

/mnt

Answer 27

Mount a point for a removable media

Question 28

/media

Answer 28

New mount point for removable media

Question 29

/dev

Answer 29

For devices like USB or mouses

Question 30

/run

Answer 30

Information about running system

Question 31

rpm -ql someprogram

Answer 31

Shows were every file in the someprogram package resides on an rpm based system

Question 32

ls -R

Answer 32

Will show files and subdirectory files

Question 33

touch -c

Answer 33

Don’t create a new file if one doesn’t exist

used for updating timestamps

Question 34

Hard link versus soft link

Answer 34

Heartland creates a duplicate under a different name but with the same Inode number

soft link points to original file

Question 35

Wildcard ? ,* ,[ad], [a-d], [^d]

Answer 35

Matches only 1 char.
* matches any number of characters
ac matches either a or d
a-d matches abcd
^d matches anything but d

Question 36

$ and ^

Answer 36

^bag matches bagger
$ matches shitbag

Question 37

grep and commands

Answer 37

-i = ignore case
-r = recursive
-e = egrep or a regular exp

Question 38

grep examples

Answer 38

grep -r [bd]ash /etc/

grep -E “(games|mail).*nologin” /etc/passwd

Question 39

find . -name *.txt

Answer 39

Finds all files in current directory that end in .txt

Question 40

wc -lwc

Answer 40

Counts lines, words and chars

Question 41

cut d and f flags

Answer 41

cut -f 6 -d “:” /etc/passwd

Selects only field 6, fields are created by the : delimiter

Question 42

sort

Answer 42

-d is alpha numeric non special char

-n is numerical

Question 43

Redirection operators

Answer 43

1. > > append
2. 2> std error, overwrites it
3. 2» std error appends
4. &> stdout and std error
   <> file is used as input and out

Question 44

$() and backticks

Answer 44

Used to group commands separately

rm $(find ./ -name *~)

Removes all that is found with a tilda at end

Question 45

tail -n 15 file and head -n 15 file

Answer 45

Last 15 lines or top 15 lines