This episode introduces the 3 common file descriptors in UNIX: standard input, standard output, and standard error.

This episode shows how you can input data using the `cat` command, and how using the Control-D character is used to signal that you're done inputting data.

This episode shows an example of redirecting the standard output, or stdout, of a command to a file.

The episode shows how to pass multiple file arguments to the `cat` command to concatenate the content of those files and redirect its standard output, or stdout, to a new file.

This episode shows how redirecting standard output with > can overwrite existing files.

This episode shows how to redirect standard output to an existing file, but instead of overwriting the contents, the data is appended.

This episode shows how to pass multiple file arguments to the `cat` command and redirect its standard output using the append operator.

This episode shows how to redirect the standard input of a file into commands such as `mail` and `cat`.

This episode shows how to pass a file as standard input to the `sort` command and then redirect the resulting standard output to a separate file.

This episode shows different notations for redirecting standard output and standard error at the same time.

This episode shows how to redirect standard output to a file and an alternate syntax for redirecting standard error to a separate file.

This episode shows how to redirect standard error to a null device, a bit bucket located at /dev/null.

This episode demonstrates how to create a `here` document, a temporary document that maintains formatting, expands environment variable names and returns the results of commands being run inside it.

This episode covers the basics of using pipes, which is a conventional approach in UNIX for single commands to be chained together to create more powerful tools.

This episode shows a practical example for how pipes can be used to analyze your command usage. A wide number of commands are used, including `history`, `cut`, `sort`, `uniq` and `head`.

This episode shows how to use the `tee` command to send standard output to the terminal and a separate file at the same time.