Unix Interview Questions and Answers
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Ques 16. How does the kernel differentiate device files and ordinary files?
Kernel checks 'type' field in the file's inode structure.
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Ques 17. How to switch to a super user status to gain privileges?
Use 'su' command. The system asks for password and when valid entry is made the user gains super user (admin) privileges.
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Ques 18. What are shell variables?
Shell variables are special variables, a name-value pair created and maintained by the shell.
Example: PATH, HOME, MAIL and TERM
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Ques 19. What is redirection?
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Directing the flow of data to the file or from the file for input or output.
Example : ls > wc
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Ques 20. How to terminate a process which is running and the specialty on command kill 0?
With the help of kill command we can terminate the process.
Syntax: kill pid
Kill 0 - kills all processes in your system except the login shell.
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