File “disk_usage.py” it’s the original program, and “disk_usage_fiexd.py” it´s the original program fixed (Other version):

whit “diff” comand,  we compare the two files, and save in “disk_usage.diff” :

diff -u disk_usage.py disk_usage_fixed.py > disk_usage.diff

The “disk_usage.diff” file contend the differences between the files.

When we will apply the changes, usa the “patch” command:

patch disk_usage.py < disk_usage.diff

We can see the program file original has been modified.

Jesus