#! /bin/sh
# SET NUMBER OF LINES TO SHOW:
case "$1" in
-[0-9]*)
    show="`expr $1 : '-\([0-9]*\)'`"
    shift
    ;;
-*) echo "Usage: `basename $0` [-n] [files...]" 1>&2
    exit 1
    ;;
*) show=10 ;;
esac

case $# in
0|1)    # READ STDIN OR SINGLE FILE, NO TITLES:
    sed -n "1,${show}p
    ${show}q" $1
    ;;
*)  # STEP THROUGH FILENAMES, SHOW TITLES FIRST:
    while :
    do
        case $# in
        0) break ;;
        esac

        if [ ! -r "$1" -o ! -f "$1" ]
        then
            echo "`basename $0`: can't read $1... skipping..." 1>&2
        else
            # SHOW TITLE BEFORE FILE:
            sed "
            1i\\
==> $1 <==
            ${show}q" $1

            # SHOW BLANK LINE AFTER ALL EXCEPT LAST FILE:
            case $# in
            1) ;;
            *) echo ;;
            esac
        fi

        shift
    done
    ;;
esac
exit