Which one of the following option is used for checking that the string is not null?(a) -a(b) -o(c) -z(d) -nI have been asked this question in quiz.Question is from Using test and [ ] to Evaluate Expressions topic in chapter 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 not null?(a) -a(b) -o(c) -z(d) -nI have been asked this question in quiz.Question is from Using test and [ ] to Evaluate Expressions topic in chapter Essential Shell Programming of Unix
Answer» The correct choice is (d) -n For EXPLANATION I would say: TEST can be USED to compare strings with ANOTHER set of operators. -n is used for checking if the STRING is not null. For example,

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Which one of the following option is used for checking that the string is not null?(a) -a(b) -o(c) -z(d) -nI have been asked this question in quiz.Question is from Using test and [ ] to Evaluate Expressions topic in chapter Essential Shell Programming of Unix

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