Which one of the following option is used for checking that the string is NULL string?(a) -a(b) -o(c) -z(d) -nI got this question in unit test.Origin of the question is Using test and [ ] to Evaluate Expressions in division Essential Shell Programming of Unix

Which one of the following option is used for checking that the string

1.	Which one of the following option is used for checking that the string is NULL string?(a) -a(b) -o(c) -z(d) -nI got this question in unit test.Origin of the question is Using test and [ ] to Evaluate Expressions in division Essential Shell Programming of Unix
Answer» The correct choice is (c) -z For explanation I WOULD SAY: test can be used to compare STRINGS with another set of OPERATORS. -z is used for checking if the STRING is null. For example,

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Which one of the following option is used for checking that the string is NULL string?(a) -a(b) -o(c) -z(d) -nI got this question in unit test.Origin of the question is Using test and [ ] to Evaluate Expressions in division Essential Shell Programming of Unix

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