c

[address1][,address2]c\
text

Replace the lines selected by the address with text. When a range of lines is specified, all lines as a group are replaced by a single copy of text. The newline following each line of text must be escaped by a backslash, except the last line. The contents of the pattern space are, in effect, deleted and no subsequent editing commands can be applied to it (or text).

Example

# Replace first 100 lines in a file:
1,100c\
\
<First 100 names to be supplied>