21. Which of the following commands can be used to replace 'professor' with 'director' throughout the whole file?
22. Which option is used for selecting repeated entries?
23. Where is the exit status of a command stored?
24. Which of the following command is used for viewing the attributes of contents of an archive?
25. Which of the following is not a subset of BRE (basic regular expression) character subset?
26. There are . . . . . . . . distinct phases of a process.
27. Which data structure is used to store information about a process?
28. POSIX shell provides job control facilities like bg or fg.
29. The action that a signal takes on receipt of a signal is called . . . . . . . .
30. To repeat a string, perl uses . . . . . . . . operator.
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