Replace (change) the lines selected by the address(es) with text. (See a for details on text.) When a range of lines is specified, all lines are replaced as a group by a single copy of text. The contents of the pattern space are, in effect, deleted, and no subsequent editing commands can be applied to the pattern space (or to text).
# Replace first 100 lines in a file: 1,100c\ \ <First 100 names to be supplied>