UNIX> ls UNIX> prdr UNIX> mkdir d1 UNIX> mkdir d2 UNIX> mkdir d1/d3 UNIX> prdr ./d1 ./d1/d3 ./d2 UNIX> echo "Jim" > d1/d3/f1 UNIX> prdr ./d1 ./d1/d3 ./d2 UNIX>See the cheat sheet for the syntax of calls that will help you. Do not worry about running out of open files if there are 60+ levels of nested directories.