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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