Summary
Running programs, or processes, have three standard communication channels: standard input, standard output, and standard error.
You can use I/O redirection to read standard input from a file or to write the output or errors from a process to a file.
Pipelines can connect standard output from one process to the standard input of another process, and can format output or build complex commands.
Know how to use at least one command-line text editor, and Vim is the recommended option because it is commonly installed by default in Linux distributions.
Shell variables can help you to run commands, and are unique to a shell session.
You can modify the behavior of the shell or the processes with environment variables
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