View and Navigate

Question 1

What does the head command do?

Answer 1

Displays the beginning of a file.

Question 2

Why is head useful?

Answer 2

Quick checks on header or initial configurations.

Question 3

Default behavior of head?

Answer 3

Shows the first 10 lines.

Question 4

Syntax of head?

Answer 4

head [options] file

Question 5

Example: View first 50 lines?

Answer 5

head -n 50 /etc/apache2/httpd.conf

Question 6

What does tail do?

Answer 6

Shows the end of a file.

Question 7

Why is tail useful?

Answer 7

Real-time monitoring of log files.

Question 8

Default behavior of tail?

Answer 8

Displays last 10 lines.

Question 9

Syntax of tail?

Answer 9

tail [options] file

Question 10

Example: monitor logs in real time?

Answer 10

tail -n 20 -f /var/log/syslog

Question 11

What does -n mean in tail?

Answer 11

Specifies number of lines.

Question 12

What does -f mean in tail?

Answer 12

Follows file as it grows.

Question 13

What does more do?

Answer 13

Views long files one page at a time.

Question 14

What type of tool is more?

Answer 14

A pager.

Question 15

Syntax of more?

Answer 15

more [options] file

Question 16

Example using more with pipe?

Answer 16

cat /var/log/syslog | more

Question 17

How to scroll in more?

Answer 17

Spacebar for pages, Enter for lines.

Question 18

What does less do?

Answer 18

Enhanced pager with backward scrolling and searching.

Question 19

Why is less better than more?

Answer 19

Supports backward navigation and search.

Question 20

Syntax of less?

Answer 20

less [options] file

Question 21

Example of interactive viewing?

Answer 21

cat /etc/passwd | less