D (delete) Command

D[number-of-lines]: Use the D (delete) command to delete a line or block of lines. No other line commands can be entered on the lines to be deleted.
number-of-lines: Specifies the number of lines to be deleted.
D: Specifies a single line to be deleted.
Dn: Specifies the first of n lines to be deleted.
DD...DD: Specifies the first and last lines of a block of lines to be deleted.

Rules for Using the D (delete) Line Command

When using the D number-of-lines or the DD form of the command, you cannot enter any other commands on the lines being deleted.
Each DD must be paired with another DD.