#!/bin/sh -u
# Exercise #3 myscript.sh sample solution
# ------------------------------------------------------------------
# Syntax:
#   $0 (no arguments)
# ------------------------------------------------------------------
# Purpose: 
#   Create a new, empty directory.  (Remove any previous copy first.)
#   Create some files and links.  Rename some files.
#   Use the sort, uniq, sum, diff, head, and tail commands.
# ------------------------------------------------------------------
# Student Name:                   Ian! D. Allen
# Algonquin EMail Address:        alleni
# Student Number:                 000-000-000
# Course Number:                  NET 2003
# Lab Section Number:             010
# Professor Name:                 Ian Allen
# Assignment Name/Number/Date:    Exercise 3, due January 24, 2005
# Comment:                        Sample solution (missing comments)
# ------------------------------------------------------------------

# Use standard search path, friendly umask, ASCII collating and sorting.
#
PATH=/bin:/usr/bin ; export PATH
umask 022
LC_COLLATE=C ; export LC_COLLATE

# 5a
rm -rf "test ex3 dir"
# 5b
mkdir "test ex3 dir"
cd "test ex3 dir"
# 5c
mkdir "one" ".two" '.three *' '.<four>'
# 5d
echo 'happy  $hopping  day' > happy
# 5e
ln happy one/happy
ln happy .two/happy
ln happy '.three */happy'
ln happy '.<four>/happy'
# 5f
ls -l '.three */happy'
# 5g
sum ".<four>/happy"
# 5h
mv one/happy 'one/<foo>'
mv .two/happy '.two/*a*'
# 5i
echo 'no prompt C:\' >> 'one/<foo>'
# 5j
# bonus: sort -r */* .??*/* >sorted
sort -r one/* .two/* '.three *'/* '.<four>'/* >sorted
wc sorted
sum sorted
# 5k
uniq sorted >'.three */unique'
wc '.three */unique'
sum '.three */unique'
# 5l
head -1 '.three */unique' >.two/head
# 5m
tail -1 '.three */unique' >'.<four>/tail'
wc '.<four>/tail'
sum '.<four>/tail'
# 5n
diff 'one/<foo>' '.three */unique' >one/differences
wc one/differences
sum one/differences
# 5o
touch "one/empty linked"
ln "one/empty linked" ".two/empty linked"
ln "one/empty linked" '.three */empty linked'
ln "one/empty linked" '.<four>/empty linked'
# 5p
touch "one/empty no linked $$ $USER"
touch ".two/empty no linked $$ $USER"
touch ".three */empty no linked $$ $USER"
touch ".<four>/empty no linked $$ $USER"