NET::FTP ruby on rails vist parent directory?

Question

a=Net::FTP.open('path', 'username','password')
a.chdir('any name of directory')

But how to visit the parent directory from a.pwd()

Answer 1

Use a.chdir('..') to change to the parent directory if the host platform supports it (pretty much all platforms should) or use a.sendcmd('CDUP') to change to the parent directory in a platform-agnostic way.