for filename in *.c; do
    if sort "$filename" | uniq -d | grep include; then
        echo "$filename"
    fi
done
Acked-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Radostin Stoyanov <rstoyanov1@gmail.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>