Unix Commands

Question 1

Echo

Answer 1

Print on screen

Ex. Echo “hello world.”
> hello world.

Question 2

Man

Answer 2

Opens the “user manual” for a command. Use if unsure about how to use the command.

Ex. man vi
> opens the manual for help using ‘vi’

Question 3

vi

Answer 3

vi = “visual editor”
Command-line “notepad.”
Use to create basic text-based files.

Example file extensions:
Text file .txt
C-program file .csh 
Java file .java
Configuration files .ini

Question 4

vi commands to go from command to input mode:

Answer 4

i insert text before cursor
I insert text at beginning of current line
a append text after cursor
A append text to end of current line
o open and put text in a new line below current line
O open and put text in a new line above current line
esc exit input mode

Question 5

vi commands to enter input mode

Answer 5

i insert text before cursor
I insert text at beginning of current line
a append text after cursor
A append text to end of current line
o open and put text in a new line below current line
O open and put text in a new line above current line
esc exit input mode (back to command mode)

Question 6

vi commands to save and exit vi

Answer 6

:wq - write and quit

:q! - quit without writing