Since you're on OS X, you can use the mdfind
command – which queries the Spotlight database — to find the file:
$ mdfind -name requirements.txt
In theory it's possible to filter those results by the time they were created, but it's likely simplest to chain that to xargs
to get the mtimes:
$ mdfind -0 -name requirements.txt | xargs -0 ls -alht
This will give you a list of all the requirements.txt
files on your system, sorted by the time they were last modified.