21. Which command is used for comparing two files?
						
					22. Each entry of directory file has component(s) namely . . . . . . . .
						
					23. Which option is used with cmp command to display a detailed list of mismatches?
						
					24. To recover from a crash, we can use . . . . . . . . command.
						
					25. To check whether the file has actually been stored in the default order, we can use . . . . . . . . option.
						
					26. Which of the following symbols are used for searching a pattern in vi?
						
					27. Which of the following pattern is used for extracting a substring using expr?
						
					28. Which of the following is referred to as default variable?
						
					29. In ex-mode, last line is represented by . . . . . . . .
						
					30. chmod command can take multiple filenames as arguments.
						
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