8.6.14 Edit a file in place using a script

The following script will remove lines 5–10 and lines 16–20 in place.

     #!/bin/bash
     ed $1 <<EOF
     16,20d
     5,10d
     w
     q
     EOF

Here, ed commands are the same as vi command-mode commands. Editing from the back of file makes it easy for scripting.