create a pwr command similar to pwd for resources

It would be nice to have a command that provides the full path to a resource when you're cd'ed into one. Currently, pwd will only deal with directories. The idea would be to have a pwr command (program working resource) that would allow the identification of the appropriate resource. For example:

pwr
org/fourth/domain

ls
Person.java

cd Person.java

pwr
org/fourth/domain/Person.java