11. For navigation purposes, the mode should be . . . . . . . . mode.
12. -a option is used with touch command to alter the time of last access.
13. Which command permits to schedule jobs for later execution, as soon as the system load permits?
14. Which of the following is used for decompressing files?
15. Which shortcut does sed offer to replace the string Linux with Red hat Linux?
16. . . . . . . . . option is used for compressing multiple consecutive characters.
17. Which command compares two sorted files line by line?
18. By default, how many lines are displayed using the head command?
19. Which of the following is not a field stored in /etc/passwd?
20. Which one of the following is an internal command?
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