What is a CLI?
command-line interface processes commands to a computer program in the form of lines of text
What is a GUI?
graphical user interface -
form of user interface that allows users to interact with electronic devices through graphical icons and audio indicator
man
an interface to the on-line reference manuals
man man
cat
combine the contents of files
cat hello.txt hi.txt
ls
lists files and directories
touch
creates new file
touch hi.txt
echo
prints text to terminal
echo ‘Hello, World!’
mv
move files into a different directory
rm
delete files
cp
copy files