How to take route as a tcl file in ICC2.

first switch of pin,ports,terminal,cells.

then select all route in gui.

then come to chell and use this command

lsort -unique [get_attribute [get_selection] object_class]
shapes vias

Then it will show Shapes if u have any vias in ur route then it will show shapes and Vias

Then next use this command 

write_routes -objects [get_selection] -output filename.tcl
now routes are generated as tcl file.