What command is not used to list the files chap01, chap02 and chap04? A. ls chap* B. ls chap[124] C. ls – x chap0[124] D. ls chap0[124] E. None of the above

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” option3=”ls – x chap0[124]” option4=”ls chap0[124] E. None of the above” correct=”option2″]

The correct answer is: B. ls chap[124]

The command ls lists the contents of the current directory. The asterisk (*) is a wildcard character that matches any number of characters. So, the command ls chap* will list all files and directories whose names start with “chap”. The command ls chap[124] will list all files and directories whose names start with “chap” and have one of the digits 1, 2, or 4 in the second position. However, this command will not list the file “chap03”.

The command ls -x chap0[124] is similar to the command ls chap[124], but it will also list hidden files. Hidden files are files whose names start with a dot (.). The file “chap03” is a hidden file, so it will be listed by the command ls -x chap0[124], but it will not be listed by the command ls chap[124].

The command ls chap0[124] is not used to list the files chap01, chap02, and chap04.