Each student will be able to:

• Describe the permissions represented by -rw-r--r--.
• Describe the permissions represented by "755".
• Describe what the "umask" in Linux does.
• Given a graphical (tree) representation of a Linux file system, and an indication of which directory is currently '.', and which directory is currently the "target", write a cd command to move from the current directory to the target directory.
• Describe the differences in how buffered and unbuffered program I/O are "implemented" in Linux. What relative advantage(s) are incurred by each of buffered and unbuffered I/O.
• Describe how Direct-Memory Access can be used to speed up programmed I/O.
• Describe the difference between a "hard" link and a "symbolic" link.
• Describe the difference between a "regular" Unix file and a "special" Unix file.