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=item B<--linebyline>, B<--lxl>

Compare input data line-by-line.  Consider the inputs as pairs of two
lines each, and output the result of comparing each two lines.

Suppose you have a document with old and new text on lines beginning
with L<OLD:> and L<NEW:> labels.

    OLD: this is old text
    NEW: and this is updated document

Only this old/new part can be compared using B<greple>'s B<-Mtee>
module as follows.

    greple -Mtee cdif --lxl -- --cm=N -GE '^OLD: (.*\n)^NEW: (.*\n)'

B<-Mtee> module sends matched parts to the filter command and replace
them by its result.  Consult L<App::Greple::tee> for detail.

You can use L<teip(1)> command as well.