Task

Verify that a file called     input.txt     and   a directory called     docs     exist.



This should be done twice:  

   once for the current working directory,   and
   once for a file and a directory in the filesystem root.


Optional criteria (May 2015):   verify it works with:

   zero-length files
   an unusual filename:     `Abdu'l-Bahá.txt  


every dir := !["./","/"] do {
   write("file ", f := dir || "input.txt", if stat(f) then " exists." else " doesn't exist.") 
   write("directory ", f := dir || "docs", if stat(f) then " exists." else " doesn't exist.") 
   }