= Delete set of lines.
DROp {x | nx} [rep] {all | .lab1 .lab2}
(DELete can be used on edit screen alternatively.)
-x :delete excluded lines at once.
nx :delete not excluded lines at once.
-rep:replace deleted lines by one line " nn lines deleted ".
-all:through the file
-.lab1/2:Limit drop line range using a pair of label
on lineno column. line number may be used so as to
limit line range with no label on lineno column.
ex) "DRO x .from .to" , "DRO x .120 .150".