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Which symbol is used with the set command for command substitution?

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Which symbol is used with the set command for command substitution?

(a) –

(b) —

(c) ??

(d) _

The question was posed to me in semester exam.

This intriguing question originated from Shell Programming using Various Commands topic in section Essential Shell Programming of Unix

1 Answer

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Correct answer is (b) —

For explanation I would say: set statement can also be used for command substitution. There can be a problem especially when the output of the command begins with a-.It may happen that set interprets it as an option. To avoid this condition, we have to use — (double hyphen) immediately after set. For example,

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