QUESTION 17 What does the Linux command chmod do? Changes file access permissions Changes file owner and group permissions Compares the contents of two files Changes the modification date of the file O Chang QUESTION 18 What appears on the terminal after the following is entered? $ echo a ; echo b > out (no output) a ab O a b

To combine two text files to form a new text file, we will use the following command: Group of answer choices COMPACT file1.txt+file2.txt file3.txt ROBOCOPY file1.txt+file2.txt file3.txt MOVE file1.txt+file2.txt file3.txt COPY file1.txt+file2.txt file3.txt

In Linux: What are hidden files ? Explain with an example Mention that filename begins with "." (dot)

what file keeps track of what commands a user is allowed to run as an administrator on a Linux system ? a) /etc/admin b) /etc/su.conf c) /etc/sudoers d) This functionality doesn't exist in Linux