#!/bin/sh -u
# Sample solution to Exercise #6
#-------------------------------------------------------
# Your assignment label would go here.
#-------------------------------------------------------
# -IAN! idallen@idallen.ca

# Use a standard search path and umask for the commands in this script.
# (All scripts must set PATH and umask so that they always work properly.)
#
PATH=/bin:/usr/bin 
export PATH
umask 022

# Create a new temporary directory and make it the current directory.
# We will extract some tar files into this directory.
#
mkdir newdir
cd newdir

# Copy the hidden tar file from the instructor to the current directory.
# Run wc on the tar file to show that it copied correctly.
# Expand the tar file and remove it.
# Show that there are now 3 files in the current directory.
#
cp -p ~idallen/public_html/teaching/dat2330/03f/notes/.exercise06.tar my.tar
wc my.tar
tar xpf my.tar
rm my.tar
ls | wc

# We already determined that files part2 and part3 are more tar files.
# Expand these two tar files and delete them.
# Run a word count on the directory to show how many files it contains.
# Run a second count to show how many files start with the letter 'x'.
#
tar xpf part2
tar xpf part3
rm part[23]
ls | wc 
ls x* | wc 

# Many of the files are not readable; fix all the permissions.
# Concatenate all 816 files, in order, into a new JPEG image file.
# Run wc and sum to verify the size and content of the new file.
#
chmod +r *
cat part1 x* >tux.jpg
wc tux.jpg
sum tux.jpg

# Remove the 816 files and leave behind the tux.jpg file.
# (The "-f" stops "rm" from prompting.)
# Move the tux.jpg file up to the parent directory.
#
rm -f part1 x*
mv tux.jpg ..

# Optional - tidy up by removing the (empty) temporary directory.
#
cd ..
rmdir newdir