21. . . . . . . . . system call is used for writing to a file.
22. To know the PID of your current shell, which command will be used?
23. A user-defined variable is initialized to . . . . . . . .
24. -f option when used with mv command overwrites existing files without prompting any messages.
25. Which of the following is performed by expr string handling's function?
26. Which of the following is a correct syntax for performing substitution on a file?
27. For locating the first position of a character in a string we can use expr command.
28. Which function is used by perl for displaying the length of a string?
29. What are positional parameters?
30. We can run the jobs in the background in UNIX.
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