This program takes a file and plots a graph with the alphabets in x-axis and their frequency in y-axis. The code is written in python 2.

Requirements:
numpy.
Matplotlib -- To plot the bar graph.
Python2.7

Installing Dependencies:
The following packages are required

1. Numpy.
2. Matplotlib.

In ubuntu:
Numpy: $ sudo apt-get install python-numpy python-scipy
Matplotlib: $ sudo apt-get install python-matplotlib

In osx:
Install the packages either from macports or homebrew. You can also install these packages manually from source.

USAGE: python freq.py [args] [filename with exact path]
HELP: python freq.py -h

By default the program looks for alphabets(Both lower and upper case). It also supports numbers and symbols.

Arguments:
-u Only upper case letters.
-l Only lower case letters.
-n Numbers.
-p Punctuation(Symbols).
-a Alphabets(upper and lower) Numbers and Punctuation.

If no argument is specified, the default alphabets(lower and upper case) is taken.
You cannot specify multiple arguments.