B$.$ Write down the LINUX commands to accomplish the following tasks $(5+5)$:

B$1.$ Assume you are currently within root directory at your LINUX machine

terminal $($i$.$e$.,$ Command Line Interface$).$ Navigate to the following directory:

$/$user$/$myspace$/$computersystems

Create a new directory named $$mydir$$ here.

Navigate to the newly created $$mydir$.$

Create a file named $$mytestfile$.$txt$.$

Check if the file has successfully been created.

B$2.$ Check the access permissions of this file $($mytestfile$.$txt$)$ created above.

Please note that r$=$read, w$=$write, and x$=$execute.

Now consider the following:

$0=$ No Permission

$1=$ Execute

$2=$ Write

$4=$ Read

Change the access permissions for full access to owner and owning group, but

only read access to others.

Check back again the access permissions to ensure they have been changed for

your file