The other day I needed to update a bunch of links inside several files for a website, which was hosted on a Windows 2000 server (ugh!). I had no idea which files needed to be updated, and there were well over 60 files. You may recall I had to do the very same thing a week earlier, however that website was hosted on a Linux machine.
Then I realized I had installed Cygwin on the Windows 2000 server awhile back, but never got around to using it! I copied and pasted the search and replace command I had used on the Linux machine and pasted it in the Cygwin console, changing the directory to the one I needed to search. Ten seconds later, all the files were updated!
After this event, I have a new found respect for Cygwin.