Bash Command
A command is an instruction you give the shell, like ls, cd or mkdir.
The first word is the command name. The words after it are its options and arguments. If Bash does not know the name, it says command not found.
Run a few commands
mkdir my_directory
cd my_directory
touch my_file.txt
ls
my_file.txtA command Bash does not know
ech hello
bash: ech: command not found
