find full path given partial path

This one worked for me (using bash)

ls -l /**/folder1/subfolder2/**

You may do it like below:

find . -path "*folder1/folder2" -prune -exec find {} -type f -name file.txt \;

With -prune you don't recurse after first match in a directory

Use the -path option:

find . -path '*/folder1/subfolder2/*'