Q. Which of the following is an invalid variable?

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Q. Command substitution requires the command to use ________

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Q. The command is valid.

$ ls -lRa $HOME > home.ls

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Q. The UNIX shell is both _______ and _______ language.

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Q. Which of the following function(s) are performed by an interactive shell?

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Q. Every feature used in an interactive shell can also be used by a shell script.

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Q. Which one of the following is arguably the best shell to use?

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Q. Which one of the following command is used to create a child shell?

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Q. Shell variables are of ____ types.

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Q. Suppose ABD_DIR is a local variable. Then it will be accessible to the child process.

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Q. ____ command is used to display the environment variables only.

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Q. Which symbol is used for setting the PS1 prompt to show the current event number?

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Q. set command by default displays the variables in the current shell.

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Q. Which one of the following keyword is used with the set command to avoid overwrite existing file?

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Q. To prevent accident logging out, we can use ____ as a keyword with the set command.

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Q. Which of the following features of UNIX may be used for inter process communication?

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Q. In a system, if 5 people are currently using the vi editor. then the number of corresponding processes will be

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Q. The command echo welcome > /dev / tty

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Q. dev/null

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Q. The advantage of binary files over text files is that

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