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Groups of common lines, with a blank gutter, are copied from the first
file to the output.  After each group of differing lines, sdiff
prompts with `%' and pauses, waiting for one of the following
commands.  Follow each command with RET.
- `e'
- 
Discard both versions.
Invoke a text editor on an empty temporary file,
then copy the resulting file to the output.
- `eb'
- 
Concatenate the two versions, edit the result in a temporary file,
then copy the edited result to the output.
- `el'
- 
Edit a copy of the left version, then copy the result to the output.
- `er'
- 
Edit a copy of the right version, then copy the result to the output.
- `l'
- 
Copy the left version to the output.
- `q'
- 
Quit.
- `r'
- 
Copy the right version to the output.
- `s'
- 
Silently copy common lines.
- `v'
- 
Verbosely copy common lines.  This is the default.
The text editor invoked is specified by the EDITOR environment
variable if it is set.  The default is system-dependent.
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