The command that can be used to display any email messages awaiting delivery alongside the reason that they were not delivered is known as Mailq.
<h3>What is Email?</h3>
Email stands for Electronic mail. It may be defined as a type of method that significantly involves the exchange of computer-stored messages from one user to one or more recipients via the internet.
The command "Mailq" stands for mail queue. It is the command in Linux that prints the queued mail gain in form of sending it to the user. This command prints a list of messages that are in the mail queue. It is the same as the Sendmail-bp command.
Therefore, "mailq" is the command that can be used to display any email messages awaiting delivery alongside the reason that they were not delivered.
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The answer is Tablets. It is a portable personal computer, generally with a mobile operating system and LCD touchscreen display processing circuitry, and a rechargeable battery in a single thin, flat package. It is bigger than smartphones.
Answer:
D. a potential hazard
Explanation:
Abrupt changes in road surface or the shape of the road may indicate a potential hazard.
Mechanical mouse has a ball that turns rollers inside. If friction is lost between the ball and the mousing surface, or between the ball and the rollers, the mouse fails to work. In order to assure good contact with the mousing surface, the ball must be fairly heavy. When you change directions with the mouse, you must make the ball change rolling directions--an action that inertia likes to prevent.
An optical mouse makes use of an LED and some optics to detect surface texture and the changes in it as the mouse is moved. There are no moving parts
Characteristics
based on vaccum tubes
they were large,slow,low capacity
Magnetic drums for primary memory
used mll
input punched cards and output printsout
expensive
get heated faster
eg. ENIAC,UNIVAC
