Bash Cmds

Question 1

Cd

Answer 1

Change directory

Question 2

.. or .

Answer 2

Parent directory

Current directory

Question 3

~

Answer 3

Home directory

Question 4

Vi

Answer 4

Text editor

Question 5

Ls

Answer 5

List

Question 6

Ls user

Answer 6

Lists directories

Question 7

Pwd

Answer 7

Print working directory

Question 8

Ls-s

Answer 8

Reference to a file

Question 9

Chmod

Answer 9

Give permissions

Question 10

Less[file]

Answer 10

Show one page at a time

Question 11

Touch file

Answer 11

Create a file

Question 12

Ls -l file

Answer 12

Gives info about file

Question 13

Echo

Answer 13

Display a line of txt/str on stdr or file

Question 14

Rm

Answer 14

Remove

Question 15

Type

Answer 15

Determine if cmd built in, an alias, or executable

Question 16

Cat[file 1,file 2]

Answer 16

Copy files to stdout as listed

Question 17

Date

Answer 17

Displays date and time

Question 18

Wc[file]

Answer 18

Word count (#lines, words, chars)

Question 19

Clear

Answer 19

Clears screen

Question 20

help[cmd]

Answer 20

Display description of shell cmd

Question 21

< > &raquo_space; >& <>

Answer 21

• stdin
• stdout
• append
• stdout/stderr
• stdout/stdin

Question 22

*

Answer 22

All

Question 23

?

Answer 23

any 1 character

Question 24

[abc]

Answer 24

Any char in set

Question 25

[!abc]

Answer 25

Any char not in set

Question 26

$

Answer 26

Variables

Question 27

Cp

Answer 27

Copy

Question 28

History

Answer 28

500 lines of history

Question 29

History n

Answer 29

Most recent n cmds

Question 30

History -c

Answer 30

Delete history

Question 31

!!

Answer 31

Repeat last cmd

Question 32

!n

Answer 32

Repeat cmd n

Question 33

! -n

Answer 33

Repeat cmd n cmds ago

Question 34

!foo

Answer 34

Repeat cmd started with foo

Question 35

Env

Answer 35

Display environment variables

Question 36

“=“

Answer 36

Set bar

Question 37

$PATH

Answer 37

Displays list directory

Question 38

Export

Answer 38

Export shell variables

Question 39

• e
• fi
• d
• w
• o

Answer 39

• switch that determines if file at a particular path
• end of an if block
• True if file is reg file
• true if file exists and is writable
• true if your the user

Question 40

Make vars ints

Answer 40

Have to use casting

(y=y+1)

Question 41

Or / and

Answer 41

&& ||

Question 42

-lt

Answer 42

Less than

Question 43

mkdir

Answer 43

Make directory (creates a new folder)
Ex) mkdir ~/Desktop/seng265

Question 44

mv

Answer 44

Moves file from one place to another

ex) mv

Question 45

Vim [filename]

Answer 45

Opens file in txt editor (creates new file if non specified

Command mode: issue cmds
Insert mode: type text

Question 46

Set

Answer 46

Displays environment and shell variables