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Which stream is used for representing error messages?

(a) standard input

(b) standard output

(c) standard error

(d) error

This question was addressed to me by my school principal while I was bunking the class.

I want to ask this question from Redirection and Pipes topic in portion The Shell of Unix

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Right option is (c) standard error

The best explanation: The standard error (or stream) is used for representing error messages that emanate from the command or shell. This stream is also connected to the display as error messages are displayed on the terminal.

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