Command Line

Question 1

Command

Answer 1

• Sequence of characters in a line which ends by pressing enter and is subsequently evaluated by the shell
• What to do

Question 2

Options command line parameter

Answer 2

• Start with a dash
• also called switches
• How to do it

Question 3

Argument command line parameter

Answer 3

• No leading dash
• Often names of files
• What to do it with

Question 4

Typical command line format

Answer 4

• Command, Option, Argument
• can vary depending on the program

Question 5

Shell Script

Answer 5

File containing a series of commands

Question 6

Variables

Answer 6

• Areas of memory that can be used to store information and are referred to by a name
• “$name” create variable
• name=david set value of variable
• by convention all upercase

Question 7

Variable requirements

Answer 7

• Start with a letter
• No spaces
• No punctuation marks

Question 8

printenv

Answer 8

Displays environmental variables

Question 9

Meta character

Question 10

Quoting

Answer 10

• Act of protecting shell meta-characters from being treated specially by the shell
• “” not treated as wildcard when quoted (or ‘’ or *
• Prevents shell from acting on and expanding the meta-characters
• ”” ‘’ \

Question 11

~

Answer 11

Represents home directory

Question 12

ls

Answer 12

• List contents of current directory
• -ls list with addtional detail

Question 13

Manual (Man) Pages

Answer 13

• A set of pages explaining every command available on the system
• $man command you want to use
• -k (executes key word search of man pages)

Question 14

Info Pages

Answer 14

• Like MAN pages but more detailed
• Divided into different nodes or pages and works like a web browser
• p previous, n next, q exit

Question 15

dmesg command

Answer 15

Shows system boot time messages.

Question 16

CTRL + SHIFT + C

Answer 16

Copy highlighted text while working in the command line

Question 17

$0, $1, $2, ect

Answer 17

• Predefined variables
• $0 refers to current script
• $1 refers to fist line, $2 the second, and so on

Question 18

\d

Answer 18

Add the date to the prompt in the shell

Question 19

which command

Answer 19

Search for executable programs or scripts located in the PATH variable

Question 20

whereis command

Answer 20

Locate the executable, source, and manual page files for any command

Question 21

variable_name=$(command) or
variable_name=’command’

Answer 21

Save the out put of a command into a variable

Question 22

apropos command

Answer 22

searches manual page names and descriptions for a user-supplied keyword