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Vikentia [17]
3 years ago
5

which of the following electromagnetic waves are not used for communication? a.gamma rays b.microwaves c.infrared waves d.radio

waves
Computers and Technology
1 answer:
Flura [38]3 years ago
3 0

Gamma rays are not used for communication.

-- We have no safe way to generate them.
-- We have no cheap way to detect them.
-- We have no way to impress information on them (modulate them).
-- They're dangerous.

Otherwise they're ideal for communication.


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List any 5 Unix commands with their brief description?
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Answer:

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.

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3) banner

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1)cal:

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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:

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4) who

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

Syntax:

$who

or

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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.

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