UNIX Commands

Question 1

man

Answer 1

Displays on-line manual pages about command.

Question 2

clear

Answer 2

Clears the current screen providing an empty terminal window.

Question 3

pwd

Answer 3

Print working directory, displays the current working directory.

Question 4

date

Answer 4

Prints or sets the system date and/or time

Question 5

tree

Answer 5

Lists directory contents in a tree-like format

Question 6

exit

Answer 6

Exit the current shell

Question 7

ls
ls -l
ls -i
ls -s
ls -a

Answer 7

Lists contents of a directory
long list - shows ownership, permission, and links
-i Displays inode number in the first field
-s Displays number of file system blocks used by file
-a List all files including invisible files

Question 8

less
less b
less /
less q

Answer 8

Displays text files one screen at a time
Allows backwards movement, one page at a time
/ Initiates a search for a string (word)
q Exits from less
SPACE BAR Advances one screen at a time
ENTER Key Advances one line at a time

Question 9

more

Answer 9

Displays text files one screen at a time

Works like the less command but with fewer options

Question 10

head

Answer 10

Automatically prints the first 10 lines of a file to standard output

Question 11

tail

Answer 11

command automatically displays the last 10 line

Question 12

cat

Answer 12

Displays file(s) contents to the screen and can concatenate (combine) files

Question 13

echo

Answer 13

will print to the screen anything following it