Concepts covered in this lesson:

• A deeper look at standard input, standard output, and standard error.
• File descriptors.
• Redirecting standard output to a file.
• Redirecting standard error to a file.
• Redirecting standard output and error to a file.
• Redirecting standard input from a file.
• Redirecting standard output and error through a pipe.
• Redirecting standard error to standard output.
• Redirecting standard output to standard error.
• Overwriting and appending output to a file.
• The null device.