Red Hat System Administration I
In this chapter, you learned:
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 write the output or errors from a process to a file.
Pipelines can be used to connect standard output from one process to standard input of another process, and can be used to format output or build complex commands.
You should know how to use at least one command-line text editor, and Vim is generally installed.
Shell variables can help you run commands and are unique to a particular shell session.
Environment variables can help you configure the behavior of the shell or the processes it starts.
