#!/bin/sh -u
# Answer file: Exercise #4 - exercise04script.sh
# -Ian! D. Allen - idallen@idallen.ca

# set and export standard shell search path, friendly umask
#
PATH=/bin:/usr/bin ; export PATH
umask 022
LC_COLLATE=C ; export LC_COLLATE

# The README.txt file should be copied here as comments.
#
# I've grouped questions together in the comments below, to make the
# file more readable.
 
# 6. Remove recursively any existing directory and contents.
# 7. Create a new, empty directory.
# 8. Make the new directory our current dir to make pathnames shorter.
# 9. Show our current directory.
# 10. Copy all the image fragment files into the new directory.
#
rm -rf image4
mkdir image4
cd image4
pwd
cp ~alleni/image/* .

# 11. 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

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

# 14. Display the permissions, size, and checksum of the image.jpg file.
#
ls -l image.jpg
sum image.jpg

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