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Unix Puzzle
===========
-IAN! idallen@ncf.ca

Based on Chapters 1-10 in the Linux text.

On the machine ACADAIX there is a compressed text file named
/thome/alleni/dat2330/tt/neptune/saturn_rot13.txt.gz that has had (only)
the lower-case letters encrypted (translated).  The file contents tell
you (in UPPER CASE) how the file was encrypted.  Uncompress and read
the file to learn about the encryption used.

After you understand how the file was encrypted, unencrypt the lower-case
letters in the file (reverse the translation) and read what it says.

Write an executable shell script named rot13.sh that will perform the
encryption described in the above file.  The script should read and
process the file given as the script's first command line argument.
(No error checking is required to verify that the command line argument
exists or is a file.)  Output should be to standard output.  Test it on
the saturn_rot13.txt file.

What if you apply the rot13.sh encryption to a file twice?  What is
the output?  What if you apply it three times?  Four times?  Five?