Outline for January 28

Reading: Linux book,§1–4; text, §12
Due: Homework 2, due on February 1 at 11:55pm

1. Linux
   1. File system: absolute, relative path (file) names; ls
   2. The shell, running commands
   3. Search path, other environment variables
   4. Shell wildcards
2. Handling exceptions
   1. Using global variables as error flags [except6a.py]
   2. raise [except7.py]
3. Common exceptions
   1. ZeroDivisionError — attempt to divide (or take the remainder of) something by 0
   2. TypeError — operation or function applied to operand of wrong type
   3. SyntaxError — Python parser encountered a malformed statement
   4. NameError — local or global name is not found
   5. ValueError — built-in function or operation applied to operator with illegal value
   6. EOFError — input function encounters an end of file
   7. Keyboard Interrupt — user hit the interrupt key (usually control-C)

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