Learn Linux Shell Scripting - Fundamentals of Bash 4.4

Questions

1. What are file descriptors?
2. What do the terms stdin, stdout, and stderr mean?
3. How do stdin, stdout, and stderr map to the default file descriptors?
4. What is the difference between the output redirections >, 1>, and 2>?
5. What is the difference between > and >>?
6. How can both stdout and stderr be redirected at the same time?
7. Which special devices can be used to act as a black hole for output?
8. What does a pipe do, with regards to redirections?
9. How can we send output to both the Terminal and a log file?
10. What is a typical use case for a here string?