#!/bin/sh -u
# Answer file: Exercise #2 - tuxdrinks1.sh
# -Ian! D. Allen - idallen@idallen.ca

# The README.txt file says:
# 0. [optional] remove the directory from a previous use of this script
# 1. Create a new, empty directory.
# 2. Copy all the image fragment files into the new directory.
# 3. Rename the damaged files to have their correct names.
# 4. Concatenate all 179 fragment files into one file named image.jpg
# 5. Remove all the file fragments, leaving only the image.jpg file.
# 6. Display the size and checksum of the image.jpg file.

# set and export standard shell search path, friendly umask
#
PATH=/bin:/usr/bin ; export PATH
umask 022
 
# 0. Remove recursively any existing directory and contents.
# 1. Create a new, empty directory.
# 2. Copy all the image fragment files into the new directory.
#
rm -rf newdir
mkdir newdir
cp ~idallen/image/* newdir

# Make the new directory our current dir to make pathnames shorter.
#
cd newdir

# 3. Rename the incorrectly-named files to have their correct names.
#
mv   aa  mystery\ image\ fragment\ aa
mv   bf  mystery\ image\ fragment\ bf
mv "dt " mystery\ image\ fragment\ dt
mv   go  mystery\ image\ fragment\ go
mv " gw" mystery\ image\ fragment\ gw

# 4. Concatenate all 179 fragment files into one file named image.jpg
# 5. Remove all the file fragments, leaving only the image.jpg file.
# 
cat mystery* >image.jpg
rm -f mystery* README*

# 6. Display the size and checksum of the image.jpg file.
#
ls -l *    # or use wc
sum *

# To display this image on your screen in Linux:
# xli image.jpg