CSC 352 bash commands

Question 1

absolute path

Answer 1

A path that is fully specified from the root directory down.

Question 2

relative path

Answer 2

A path that is relative to the current working directory.

Question 3

/

Answer 3

The root directory OR the character to separate directories in a path.

Question 4

“current working directory”

Answer 4

The directory the shell uses as a reference point for relative paths.

Question 5

home directory

Answer 5

The directory where that user’s files typically reside.

Question 6

pwd

Answer 6

The command that prints the shell’s current working directory

Question 7

ls

Answer 7

The command that prints the contents (files and directories) in the current working directory.

Question 8

ls

Answer 8

The command that prints the contents of the named directory .

Question 9

ls –a

Answer 9

The command to print directory contents including hidden files

Question 10

ls –l

Answer 10

The command to print directory contents in a long, more descriptive format

Question 11

.

Answer 11

The hidden directory that refers to the directory itself.

Question 12

..

Answer 12

The hidden directory that refers to a directory’s parent directory.

Question 13

man

Answer 13

The command “manual page” for a given command

Question 14

mkdir

Answer 14

The command to create a new directory

Question 15

cd

Answer 15

The command to change the current working directory to

Question 16

~

Answer 16

The user’s home directory

Question 17

cp

Answer 17

The command to make a copy of as

Question 18

cp

Answer 18

The command to make a copy of a file in another directory

Question 19

mv

Answer 19

The command to rename (and possibly move) as

Question 20

mv

Answer 20

The command to move a file to another directory

Question 21

rm

Answer 21

The command to delete file(s)

Question 22

rm -r

Answer 22

The command to delete a directory and all its contents.

Question 23

rmdir

Answer 23

The command to delete an empty directory

Question 24

cat

Answer 24

The command to print the contents of the named file

Question 25

head

Answer 25

The command to print the first 10 lines of the named file

Question 26

tail

Answer 26

The command to print the last 10 lines of the named file

Question 27

more

Answer 27

The command to print the named file , one screen at a time.

Question 28

grep

Answer 28

Print the lines in a file that contain

Question 29

wc

Answer 29

Print the number of lines, words, and characters in the named file.

Question 30

echo

Answer 30

Print the

Question 31

sort –n

Answer 31

Print the lines of sorted in numeric order

Question 32

sort

Answer 32

Print the lines of sorted in alphabetical order

Question 33

>

Answer 33

The redirection that causes the stdout of to be stored in the file

Question 34

<

Answer 34

The redirection that causes the stdin of to come from the file

Question 35

>>

Answer 35

The redirection that causes the stdout of to be appended to the file

Question 36

|

Answer 36

The redirection that causes the stdout of to be the stdin of the command

Question 37

stdin

Answer 37

The name of the input stream

Question 38

stdout

Answer 38

The name of the output stream

Question 39

stderr

Answer 39

The name of the error stream

Question 40

char x;

Answer 40

How to declare variable x as a character.

Question 41

int x;

Answer 41

How to declare variable x as an integer.

Question 42

char *p;

Answer 42

How to declare variable p as a pointer to a character.

Question 43

int *p;

Answer 43

How to declare variable p as a pointer to an integer.

Question 44

int z[10];

Answer 44

How to declare variable z as an array of 10 integers.

Question 45

char z[10];

Answer 45

How to declare variable z as an array of 10 characters.

Question 46

*p

Answer 46

How to dereference the pointer p, to refer to the value held at the address held in p.

Question 47

/dev/null

Answer 47

The permanently empty file

Question 48

touch

Answer 48

Create an empty file at , or update its modification time

Question 49

date

Answer 49

Print the current date and time

Question 50

file

Answer 50

Print the type of file at

Question 51

command 2>

Answer 51

Run , sending stderr to

Question 52

command &>

Answer 52

Run , sending stdout and stderr to

Question 53

kill -9

Answer 53

Kill the process with ID

Question 54

make

Answer 54

Build the target using the Makefile in the current directory

Question 55

history

Answer 55

Print the command history

Question 56

=

Answer 56

Set the shell variable to

Question 57

"..."

Answer 57

Shell quotation that expands variables and interprets some special characters

Question 58

...'

Answer 58

Shell quotation that interprets everything literally

Question 59

`...`

Answer 59

Shell quotation that runs the command inside and substitute its output

Question 60

USER

Answer 60

The shell environment variable set to the name of the current user

Question 61

HOME

Answer 61

The shell environment variable set to the home directory of the current user

Question 62

PATH

Answer 62

The shell environment variable set to the directories to search for commands

Question 63

SHELL

Answer 63

The shell environment variable set to the path of the current shell

Question 64

PWD

Answer 64

The shell environment variable set to the current working directory

Question 65

source

Answer 65

Execute the commands in in the current shell (as if they were typed)

Question 66

$?

Answer 66

The exit status of the last command

Question 67

cmd1 ; cmd2

Answer 67

Run cmd1, then run cmd2

Question 68

cmd1 && cmd2

Answer 68

Run cmd1, then run cmd2 only if cmd1 succeeded

Question 69

cmd1 || cmd2

Answer 69

Run cmd1, then run cmd2 only if cmd1 failed

Question 70

[[ ]]

Answer 70

Test if is true

Question 71

$(...)

Answer 71

Run the command inside and return its output

Question 72

$((...))

Answer 72

Evaluate the arithmetic expression inside

Question 73

$

Answer 73

Substitute the value of the shell variable

Question 74

(cmd)

Answer 74

Run cmd in a subshell