Hi, By mistake, I stored 1000 CCD images with wrong headers (*.hdf format). Now, I want to change the name of files only, not the creation time ot dates etc. I would really appreciate if anybody can help me to figure it out. example" Np1_Nomask05567.hdf to Np1_Nomask06567.hdf should be changed to Np1_100ummask05567.hdf to Np1_100ummask06567.hdf Thanks, Dushyant