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The "rev" command in Linux is used to reverse the lines of a file or input.

Step 1: Open the command prompt on your computer.

Step 2: Type in the command "rev" followed by the name of the file you want to reverse.

Step 3: The lines of the file will be reversed and displayed in the command prompt.

For example, if you have a file named "example.txt" with the following content:


Hello
How are you
Goodbye

Command: rev example.txt

Output:


Goodbye
How are you
Hello

You can also use it with input from the command line, by simply typing the string you want to reverse after the command

Command:

echo "Hello World" | rev

Output :

 dlroW olleH

rev

8. Cowsay

cowsay is a program that generates ASCII art pictures of a cow with a message. It can also generate pictures using pre-made images of other animals, such as Tux the Penguin, the Linux mascot. It is written in Perl. Cowsay will turn text into happy ASCII cows.

"pkg install cowsay" is a command that installs the "cowsay" package on a Unix-like operating system. The "cowsay" package contains a program that can display a message in a cow speech bubble.

Once the cowsay package is installed, running the command "cowsay (your message)" will display the message you provided in a cow speech bubble in the command prompt.

Step 1: Open the command prompt on your computer.

Step 2: Type in the command "pkg install cowsay" and press Enter.

Step 3: Wait for the package to be installed.

Step 4: Once the package is installed, type in the command "cowsay (your message)" and press Enter.

Step 5: The message will be displayed in a cow speech bubble in the command prompt.

For example, if you want to display the message "Hello World" in a cow speech bubble, you would use the command:

cowsay "Hello World"

Output:

 _____________
< Hello World >
 -------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

pkg install cowsay && cowsay (your message)