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Which of the following shell doesn’t support ! symbol for negating the character class?

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Which of the following shell doesn’t support ! symbol for negating the character class?

(a) bash

(b) bash

(c) POSIX

(d) C

I have been asked this question in a job interview.

My query is from Pattern Matching, Escaping and Quoting topic in division The Shell of Unix

1 Answer

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Best answer
Correct option is (d) C

The explanation is: The ! symbol cannot be used to negate a character class in a C shell. In fact, C shell doesn’t provide any mechanism for doing so.

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