21. awk uses . . . . . . . . dimensional arrays.
22. Which command is used to display the differences between files?
23. Which one of the following command is used to create a child shell?
24. To navigate 20 pages forward, we can use . . . . . . . . command.
25. We can use the . . . . . . . . symbol with at command to redirect our output to a specified file.
26. . . . . . . . . system call behaves in an identical manner to the kill command.
27. The following command will match 'Agarwal', 'agarwal' and 'agrawal'.
$ grep "[aA]g[ar][ar]wal" emp.lst
$ grep "[aA]g[ar][ar]wal" emp.lst
28. awk uses . . . . . . . . for splitting a line into fields.
29. For pattern-matching, awk uses regular expressions in . . . . . . . . style.
30. Which one of the following is not an attribute displayed by ls command?
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