
 Usage : rmerge [options] output_fileheader
    * notice : only serial processing

 [option]
    -o [type] : output file type     ( "text" or "binary" )
    -n [rank] : number of ranks      ( default:0 )
    -s [step] : start step number    ( default:1 )
    -e [step] : end step number      ( default:0 )
    -i [step] : interval step number ( default:1 )
    -h        : help

