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Which of the following expression is a correct wildcard pattern if we want an expression in which the last character is not numeric?

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Which of the following expression is a correct wildcard pattern if we want an expression in which the last character is not numeric?

(a) *[!0]

(b) *[0-9]

(c) [0-9]

(d) *[!0-9]

I have been asked this question during a job interview.

Question is taken from Shell Basics in division The Shell of Unix

1 Answer

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Correct option is (d) *[!0-9]

Explanation: Wildcards are used for pattern matching. The command *[!0-9] will match all expression containing any characters except that the last character entered is not numeric. Here ‘!’ is used for NOT.

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