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1. Write the command (or commands) that will display the following message 'Hello from the command line.'

echo Hello from the command line

2. Write the command (or commands) that will create a file named 'hello-world.txt'.

touch hello-world.txt

3. Write the command (or commands) that will create a folder named 'my-new-folder' in current directory.

mkdir my-new-folder

4. Write the command (or commands) that will attempt to delete a folder named 'my-nonexistent-folder' and display the following message when the commands fails: 'Whoops, cannot delete a folder that does not exist'.

rmdir my-nonexistent-folder || echo "Whoops, cannot delete a folder that does not exist."

5. Write the command (or commands) that will navigate to your desktop, and then to the parent folder of the desktop.

cd ~/Desktop/ cd ~