Wordlist

Your assignment is to write a Bash script wl.bash that creates a list of words from a text file. For instance, your program should be able to do the following: 
$ cat excerpted/0

The 19 rabbits sat; then, the rabbits jumped --- oh, what a sight
o'er the land we saw the rabbits' jumping for all.

Were there a rabbit's leap so all-inspiring that we could ask "Did they
all jump so high"?
$ ./wl.bash excerpted/0
all
all-inspiring
ask
could
did
er
for
high
jump
jumped
jumping
land
leap
oh
rabbit
rabbits
sat
saw
sight
so
that
the
then
there
they
we
were
what

You can use any of Bash built-in features (echo, array variables, and so forth) to do this. You can also use any of these programs in your shell script are:

You don't necessarily need to use all of the above programs, but I don't think you can write a version that does not use any of the above programs, and that only uses Bash built-ins. (Indeed, I will give you extra credit if you write a version that only uses Bash built-ins to do this.)

As to how to do the assignment, login to cop3353.org, and create a subdirectory called "wordlist/"; then retrieve the current texts with tar: 

cop4342test@cop3353:~$ mkdir wordlist
cop4342test@cop3353:~$ cd wordlist
cop4342test@cop3353:~/wordlist$ tar xf /usr/local/Wordlist-assignment/excerpts/excerpted-2019-03-15.tar 
cop4342test@cop3353:~/wordlist$ ls
excerpted
Please create your wl.bash in the subdirectory ~/wordlist/ (not in your home directory or in ~/wordlist/excerpted).

The contents of the tar file are: 

$ ls -al
total 2780
drwx------ 2 cop4342test cop4342test    4096 Mar 15 16:29 .
drwxr-xr-x 3 cop4342test cop4342test    4096 Mar 15 16:39 ..
-rw-r--r-- 1 cop4342test cop4342test     212 Mar 15 15:56 0
-rw-r--r-- 1 cop4342test cop4342test     147 Mar 15 16:29 0.out
-rw------- 1 cop4342test cop4342test   84252 Mar 13 16:10 10
-rw-r--r-- 1 cop4342test cop4342test   20372 Mar 14 20:19 10.out
-rw------- 1 cop4342test cop4342test   69855 Mar 14 20:18 11
-rw-r--r-- 1 cop4342test cop4342test   14035 Mar 14 20:19 11.out
-rw-r--r-- 1 cop4342test cop4342test  261963 Mar 14 20:10 6
-rw-r--r-- 1 cop4342test cop4342test   49687 Mar 14 20:19 6.out
-rw-r--r-- 1 cop4342test cop4342test  121003 Mar 14 20:53 7
-rw-r--r-- 1 cop4342test cop4342test   28904 Mar 14 20:19 7.out
-rw-r--r-- 1 cop4342test cop4342test 1751447 Mar 14 18:02 8
-rw-r--r-- 1 cop4342test cop4342test  138141 Mar 14 20:19 8.out
-rw------- 1 cop4342test cop4342test  218915 Mar 14 20:16 9
-rw-r--r-- 1 cop4342test cop4342test   45346 Mar 14 20:19 9.out
The ".out" files are sample output that you can compare your results with. The unadorned numbered files are your sample input files.

Please make sure that you downcase all your output, that you remove all duplicates, and that you put everything in alphabetical order.

This assignment is due by the beginning of class on Wednesday, March 27. Your programs should be able to produce identical output for the sample files, and should be able to handle similar text files in addition to the provided samples.