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21. You have a terminal window open and the current directory is your home directory. You need to create a new file in your home directory named office.txt using the vi editor. Which of the following commands should you use to do this?
23. John needs to change the permissions of a file named access.odt such that the file owner can edit the file. The sales staff who are members of the group that owns the file should be able to edit it. The sales staff who are not the owners and do not belong to the owning group can view it, but not modify it. Which of the following commands will help them do this?