At the command prompt, type cd $/$foruser$1$ and press Enter to enter the foruser$1$ directory. Next, type ls $-$F at the command prompt and press Enter. Are there any files in this directory? Type cp $/$etc$/$hosts $.$ at the command prompt and press Enter. Next, type ls $-$F at the command prompt and press Enter to ensure that a copy of the hosts file was made in your current directory.

$9$

Switch to a different command$-$line terminal $($tty$3)$ by pressing Ctrl$+$Alt$+$F$3$ and log in to the terminal using the user name of user$1$ and the password of LINUXrocks!.

$10$

At the command prompt, type cd $/$foruser$1$ and press Enter. Were you successful? Why? Next, type ls $-$F at the command prompt and press Enter. Were you able to see the contents of the directory? Why? Next, type rm $$f hosts at the command prompt and press Enter. Why did you receive an error message?

$11$

Switch back to your previous command$-$line terminal $($tty$5)$ by pressing Ctrl$+$Alt$+$F$5.$ Note that you are logged in as the root user on this terminal and within the $/$foruser$1$ directory.

$12$

At the command prompt, type chmod o$+$w $/$foruser$1$ and press Enter. Were you able to change the permissions on the $/$foruser$1$ directory successfully? Why?

$13$

Switch back to your previous command$-$line terminal $($tty$3)$ by pressing Ctrl$+$Alt$+$F$3.$ Note that you are logged in as the user$1$ user on this terminal and within the $/$foruser$1$ directory.

$14$

At the command prompt, type rm $$f hosts at the command prompt and press Enter. Were you successful now? Why?

$15$

Switch back to your previous command$-$line terminal $($tty$5)$ by pressing Ctrl$+$Alt$+$F$5.$ Note that you are logged in as the root user on this terminal.

$16$

At the command prompt, type cp $/$etc$/$hosts $.$ at the command prompt and press Enter to place another copy of the hosts file in your current directory $(/$foruser$1).$

$17$

At the command prompt, type ls $$l and press Enter. Who is the owner and group owner of this file? If you were logged in as the user user$1,$ in which category would you be placed $($user$,$ group, other$)?$ What permissions does user$1$ have as this category $($read$,$ write, execute$)?$

$18$

Switch back to your previous command$-$line terminal $($tty$3)$ by pressing Ctrl$+$Alt$+$F$3.$ Note that you are logged in as the user$1$ user on this terminal and in the $/$foruser$1$ directory.

$19$

At the command prompt, type cat hosts at the command prompt and press Enter. Were you successful? Why? Next, type vi hosts at the command prompt to open the hosts file in the vi editor. Delete the first line of this file and save your changes. Were you successful? Why? Exit the vi editor and discard your changes.

$20$

Switch back to your previous command$-$line terminal $($tty$5)$ by pressing Ctrl$+$Alt$+$F$5.$ Note that you are logged in as the root user on this terminal and in the $/$foruser$1$ directory.

$21$

At the command prompt, type chmod o$+$w hosts and press Enter.

$22$

Switch back to your previous command$-$line terminal $($tty$3)$ by pressing Ctrl$+$Alt$+$F$3.$ Note that you are logged in as the user$1$ user on this terminal and in the $/$foruser$1$ directory.

$23$

At the command prompt, type vi hosts at the command prompt to open the hosts file in the vi editor. Delete the first line of this file and save your changes. Why were you successful this time? Exit the vi editor.

$24$

At the command prompt, type ls $-$l and press Enter. Do you have permission to execute the hosts file? Should you make this file executable? Why? Next, type ls $$l $/$usr$/$bin at the command prompt and press Enter. Note how many of these files to which you have execute permission. Type file $/$usr$/$bin$/*|$ more at the command prompt and press Enter to view the file types of the files in the $/$bin directory. Should these files have the execute permission?