Which of the following is not a communication command? A. grep B. mail C. mesg D. write E. None of the above

grep
mail
mesg
write E. None of the above

The correct answer is: A. grep

grep is a command-line utility for searching plain-text data sets for lines that match a regular expression. It is one of the most widely used utilities in Unix-like operating systems.

mail is a command-line utility for sending and receiving email messages. It is a simple and easy-to-use tool that can be used to communicate with other users on the same system or on a remote system.

mesg is a command-line utility for managing the user’s message queue. It can be used to send and receive messages from other users on the same system.

write is a command-line utility for sending a message to another user on the same system. It is a simple and easy-to-use tool that can be used to communicate with other users quickly and easily.

Therefore, grep is not a communication command.

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