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  


function output( s, b )
    if b then
        print ( s, " does not exist." )
    else
        print ( s, " does exist." )
    end    
end
 
output( "input.txt",  io.open( "input.txt", "r" ) == nil )
output( "/input.txt", io.open( "/input.txt", "r" ) == nil )
output( "docs",  io.open( "docs", "r" ) == nil )
output( "/docs", io.open( "/docs", "r" ) == nil )