Q. POSIX recommends the use of ____ instead of archaic `command ` for command substitution.

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Q. Which of the following shell doesn’t support the command substitution using $ recommended by POSIX?

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Q. Which symbol is used for assigning a value to variables?

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Q. Which symbol is used for evaluation of variables?

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Q. Which of the following is a correct initialization of variables to null strings?

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Q. A variable can be removed using _____

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Q. readonly command is used to protect a variable from reassignment.

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Q. C shell uses which command for assigning values to variables?

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Q. The variable assignment as x = 10 (whitespace on both sides of =) will work if we are not using C shell?

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Q. ____ command displays all the variables available in the current shell.

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Q. Environment variable names can be defined only in uppercase.

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Q. The shell has ____ prompts.

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Q. Which one of the following command will change our primary prompt from $ to C> ?

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Q. Which environment variable is used to display our username?

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Q. Which one of the following is not an environment variable?

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Q. Which escape sequence is used with PS1 to show the hostname of our computer?

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Q. Which of the following shells support the use of aliases?

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Q. We can display an alias definition by using an alias with the name.

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Q. Which command is used in bash and Korn shells to display the previously used commands?

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Q. To display the last five used commands, which one of the following commands is used (in bash shell)?

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