gdir = GDir.new("/ho") gdir = GDir.new("./ho")
gdir = GDir.new("/") gdir = GDir.new(".")
gdir = GDir.new("/ho/data.nc") gdir = GDir.new("/ho/data.ctl")
275492 Apr 12 19:15 hogehoge_data.nc/
u [lon=120,lat=120,z=40,t=73] 'x components of velocity' (m/s)