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Which file descriptor is used to represent standard error stream?

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Which file descriptor is used to represent standard error stream?

(a) 0

(b) 1

(c) 2

(d) 3

I got this question during an online exam.

This question is from Redirection and Pipes topic in chapter The Shell of Unix

1 Answer

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Best answer
Right answer is (c) 2

The best explanation: Each of the three standard files is represented by a number called as a file descriptor. A file is opened using its pathname, but subsequent read and write operations identify the file by this file descriptor. Whenever we enter an incorrect command or try to open a non-existent file, certain diagnostic messages are displayed onto the terminal. This is the standard error stream whose default destination is the terminal.

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