IST334: Perl in-class exam.

Perl in-class exam.3

Write a perl script named find.pl that does the following:

treats the first command line argument as a word to search for
takes other command line arguments (if any) as either list of file names or templates for file names. For example, you can run your script as either
```
c:\>perl find.pl exam test.html mydoc.php
```
which means, find the word "exam" in the file test.html and in the file mydoc.php or
```
c:\>perl find.pl assignment *.html *.txt
```
which means, search for the word "assignment" in all HTML and TXT files of the current directory.
If only one argument is given, the script should search for the specified word in all files of the current directory.
As the output, the script should print the name of the file, the number of the line where the word was found, and the line itself. For example:
```
File mydoc.txt:
 12: Complete your in class assignment by 6:20pm.
 42: This assignment is individual.
```