Question

Which of the following can be used in place of square brackets used in if condition? (a) Curly braces (b) test command (c) check command (d) All of the above

Answer 1

curly brackets is the correct answer

Answer 2

"Option (b) test command

Test command can be used in the place of square brackets that is used in if condition. In the execution of shell commands test command is used for conditional expression. The test command automatically exits after determining the expression. This replaces the square brackets ([ and ]) in the if condition and the expression can be accompanied  with test. When the return value is 0, the evaluated expression is true, else it is false."