Gives you a progress bar for an existing program that's processing a file descriptor.
$ ex-post-progress <pid> <file-paths>
It will find the file descriptors which are file-paths opened by pid automatically, and draw you a progress bar, exiting once the file decriptors have reached the end of the file.
You can also leave <file-paths> blank, in which case it will track all open file descriptors which point to regular files.