Unix Commands Interview Questions

• Construct pipes to execute the following jobs.

• Explain kill() and its possible return values.

• Explain the following commands.

• Explain the steps that a shell follows while processing a command.

• How does the kernel differentiate device files and ordinary files?

• How is the command “$cat file2 “ different from

• How many prompts are available in a UNIX system?

• How to switch to a super user status to gain privileges?

• How to terminate a process which is running and the specialty on

• Is it possible to count number char, line in a file; if so, How?

• Is it possible to create new a file system in UNIX?

• Is it possible to restrict incoming message?

• Is ‘du’ a command? If so, what is its use?

• Name the data structure used to maintain file identification?

• What are shell variables?

• What difference between cmp and diff commands?

• What does the command “ $who | sort –logfile > n

• What does the command “$ls | wc –l > file1” do

• What is a pipe and give an example?

• What is redirection?

• What is relative path and absolute path.

• What is the difference between cat and more command?

• What is the significance of the “tee” command?

• What is the use of the command "ls -x chapter[1-5]"

• What is the use of ‘grep’ command?

• What will the following command do?

• Which command is used to delete all files in the current directory

• Which of the following commands is not a filter man , (b) cat , (c)

• Write a command to display a file’s contents in va

• Write a command to kill the last background job?

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