command line merge: /home/cadviewer/onlinedemo.cadviewer.com/cadviewer_6_1_0/converters/dwgmerge2020/linux//DwgMerge_2020_L64_20_01_04 -base="" -merge="" -out="" -over -lpath="/home/cadviewer/onlinedemo.cadviewer.com/cadviewer_6_1_0/converters/dwgmerge2020/linux/"  255