The Shell

Prof. Dr. Mirco Schoenfeld

Today, we get to know the shell.

Download a pre-configured virtual machine.
Or create your own based on Ubuntu 24.04 LTS.

By the way, the user account is password protected.

Import the virtual machine into your VirtualBox host
Make sure to check for compatibility of your settings with your host machine, e.g. the guest systems’s base memory.

Now, please open a terminal and execute some commands.

Copy a text file to your home directory

cp /usr/share/common-licenses/GPL-3 .

and navigate the file.

To exit the less-reader, type q on your keyboard.

Use grep to match regular expressions in the file.

grep "GNU" GPL-3

Execute these commands and find out what they do:

grep -i "license" GPL-3

grep -n "license" GPL-3

grep -v "the" GPL-3

grep -vn "the" GPL-3

Execute these commands and find out what they do:

grep "GNU" GPL-3

grep "^GNU" GPL-3

grep "and" GPL-3

grep "and$" GPL-3

Execute these commands and find out what they do:

grep "..cept" GPL-3

grep "t[wo]o" GPL-3

grep ".ode" GPL-3
grep "[^c]ode" GPL-3

grep "^[A-Z]" GPL-3

For more examples, see