Text Modification

• addr a\
  appends lines until a line without a trailing \

• addr1,addr2 c\
  deletes the addressed lines and inserts following lines

• addr1,addr2 d = delete

• addr1,addr2 D = Deletes only the first line

• addr i\
  Inserts text followed by the pattern space

• addr1,addr2 s/old/new/
  Substitute the new string for the old pattern
  Appending g makes it global (all patterns)
  Appending p prints the pattern space if a change is made.
  Appending w and a filename appends the pattern space to a file.