plot_file_sizes.py

#!/usr/bin/env python
from sys import stdin, stdout
import csv

rdr = csv.reader(stdin, delimiter='\t')
wrt = csv.writer(stdout, delimiter='\t')

vals = []
rows = []
for row in rdr:
    val = row[0]
    val = val.replace(',','.').replace('K', '*1000').replace('M', '*1000000').replace('G', '*1000000000')
    exec('val=' + val)
    vals.append(val)
    rows.append(row)
max = max(vals)

for v, r in zip(vals,rows):
    fname = r[1]
    graph = ('*'*round((v / max) * 100))
    print(fname.rjust(64), graph, r[0])

Output and usage: