21. Each process is identified by a unique integer called . . . . . . . .
22. Which of the following files will not be listed using the following command?
ls chap0[1-4]
ls chap0[1-4]
23. The first argument is read by the shell into the parameter . . . . . . . .
24. Which command is used for renaming files?
25. dw will . . . . . . . .
26. Which one of the following option is used for AND operation in test command?
27. How can we copy a file into our current directory?
28. Which option performs recursive deletion?
29. Process table and process control block store same attributes of a process.
30. The . . . . . . . . function extracts a substring from a string.
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