Chapter 4

1. What is a file system?
   A software implementation of the way data is stored on and retrieved from a physical medium.
2. Which Linux specific file systems are most common?
   • ext4
   • XFS
   • Btrfs
3. True of false: multiple file system implementations can be used concurrently on Linux?
   True; the root file system is always a single type, but different parts of the file system tree can be used to mount other file system types on.
4. What is the journaling feature present on most Linux file system implementations?
   Journaling is the mechanism which ensures writes to disks cannot fail halfway. It greatly improves reliability of the file system.
5. On which point in the tree is the root file system mounted?
   At the highest point, on /.
6. What is the PATH variable used for?
   It is used to determine from which directory binaries can be used. You can check the contents of the PATH variable with the...