CS198 Intermediate Systems Administration DeCal
Lab #6
Joshua Kwan

I've decided to continue using the text-based format for labs simply
because making it look good is way too difficult.

This lab will test your skills with shell scripting. You need, need,
need to have the lecture (or an equivalent shell scripting guide) open
while doing this lab, as you're going to be using things you learned in
class.

There's only going to be two questions because they both involve you
writing significant shell scripts!

I. TV Episode Renamer
---------------------

You work for a television company. For archival, the company is keeping
copies of the first season of its new show, "America's Next Top Student Model."
However, the files are named oddly:

s01e01.avi
s01e02.avi
s01e03.avi
... more ...
s01e10.avi

You have been given a list of official episode names and you have been tasked
with renaming the files into this format:

1$EPISODE - $TITLE.avi

where $EPISODE is zero-padded (10 remains 10, but 3 becomes 03.)

The episode names are as follows:

Top Student Ahram
Top Student Dwight
Top Student Hubert
Top Student Micah
Top Student Jessica
Top Student Antony
Top Student Jordi
Top Student David
Top Student Nathan
Top Student Jose

(thus, episode 1 would be properly named "101 - Top Student Ahram.avi.")

Write a shell script that uses this file as input and renames each file
in the above format. I should be able to run it with:

$ rename-tv < episode_names

in a directory that contains all the original filenames.

Hints:
- Remember to prefix your script with #!/bin/sh and then chmod +x it before
  you run it. If it won't load, do you need to put "./" in front of the program
  name?
- Copy and paste the episode names into a file and use that for your testing.
- If you want to create empty files with the original filenames mentioned
  above, do this:

  for i in `seq 1 9`; do touch s01e0$i.avi; done; touch s01e10.avi

II. Pig Latin Revisited
-----------------------

Last lab, we tried to figure out a regular expression to convert a
sentence into Pig Latin. It turns out that it is much easier to do it
on a word by word level with a shell script, and you've learned all
you need to do it.

Assume sentences only contain letters and spaces, don't consider having
to special case numbers. You can either use standard input (read) or
pass the sentence on the command line, whichever you think is easier. For
the former, I should be able to run it like this:

$ echo "The quick brown fox jumped over the lazy dog" | piglatin

for the latter,

$ piglatin The quick brown fox jumped over the lazy dog

Here's how pig latin works:
- for words that start with a consonant, move the first letter to the
  end then tack on -ay.
- for words that start with a vowel, just add -ay.

Here are some tips:
- if you intend to use a read loop, read will read a whole *line* into a
  variable. To split it into words, you can include it into an inner loop
  like this:

  for word in $sentence; do
  	...
  done

  Due to the way the shell behaves, each space-separated word in the sentence
  will be iterated over one at a time. Compare this to

  for word in "$sentence"; do

  In this case, there will be only one item in the loop and it will be 
  the entire contents of $sentence.
- You can compare the first character of a word using case.
  case "$word" in
  	[aeiou]*) ... vowel case ... ;;
	*) ... everything else ... ;;
  esac

  (note: yours has to handle uppercase letters too.)

If you're confused, please come to office hour!