[Tutor] Executing a command from a specific directory

[Lie Ryan]

Ansuman Dash wrote:
> I am downloading files using various command (because files are 
> different) meant for a executable.

What is "various commands"? Are you using wget/curl or similar 
command-line downloader programs? Or are you using a python-based script 
(that uses urllib)? Or are you using a GUI-based downloader?

Then how do you invoke those "various commands"? Are you using a 
separate python and subprocess/popen to invoke them? Or are you using 
shell script? Or do you start them manually?

> So I have created event driven program to download these files one by 
> one. But some files are very huge so I want to know how can I 
> synchronize it with my code. 

Can you modify this "event driven program" so it would call your script 
when the files finished downloading?

> That means I want to make my code wait for the complete download of that 
> file and then I ll read the log file and validate that download is 
> successful.