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Which of the following are concatenation operators?

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Which of the following are concatenation operators?

(a) /

(b) .

(c) _

(d) \\

I had been asked this question in semester exam.

I need to ask this question from perl in portion Awk – An Advanced Filter & Perl – The Master Manipulator of Unix

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The correct answer is (b) .

For explanation I would say: Like in shell, concatenation is performed by placing two variables side by side. This case is not followed with perl. Rather perl uses . (dot) operator for concatenating two variables. For example,

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