The ascii plot utility is a perl based tool that
allows you to select a colomn of numeric data from any
flat file and plot it as a horizontal bar chart. 
Installing the tool is as simple as downloading the
file. It is ideal for generating plots on light weight
web servers  where  graphic utilities may not  
available.

It takes the following parameters from the
command line

-File: column formatted data file

-Columns: number of columns to scale to for the
horizontal output bar chart

-data column  the column number in the data file to
generate the plot from

-data label column:  the column from the flat file to
use as a label for each horizontal bar in the output)

-Units:  A label field to appear in the upper right of
you output.

-Rows:  Number of rows to plot starting at the end of
the data file

Given a text file called testdata containing:
192.168.1.255 4740
192.168.1.108 106690
192.168.1.101 129360
192.168.1.111 1339375

You can plot it with:
./asciiplot testdata 60 bytes 1 all 0

The result would be:
                                             bytes 1339375
 192.168.1.255 * 4740
 192.168.1.108 **** 106690
 192.168.1.101 ***** 129360
 192.168.1.111 *********************************************** 1339375