List any 5 Unix commands with their brief description?

Commands: commands are also known as "programs" and the program is a set of rules that performs a specific task which is executed by a computer.

Unix is an operating system. that supports multi-tasking and multi-user functionality. Unix is most widely used in all forms of computing systems such as desktop, laptop, and servers. It provides a Graphical user interface similar to windows.

The Unix operating system there are various commands. The list of five Unix commands can be given as:

1) cal

2) date

3) banner

4) who

5) whoami

1) cal:

The cal command stands for calender. It displays the date.

Syntax:

$ cal

or

$ cal [[month] year]

Example:

$ cal 10 2019

2) date:

The date command stands for date and time. It displays the system date and time.

Syntax:

$date

or

$ date[+format]

Example:

$ date + %d/%m/%y

3) banner

The banner command stands for display the text in to a large size.

Syntax:

$banner message

Example:

$banner Unix

4) who

The who command stands for display the list of users currently logged in.

Syntax:

$who

or

$who [option] ... [file][arg1]

Example:

$who

5) whoami

The whoami command stands for display the user id of the currently logged-in user.

Syntax:

$whoami

Example:

$whoami

Explanation:

1) cal command display the current month and year.

2) date command display system date and time.

3) banner command display text in large size.

4) who command display the user name who currently login.

5) whoami command display user id.