#!/bin/ksh

file=$1

if [ -z "$file" ]; then
        echo "usage: fcksum <file>"
        echo
        exit 1
fi

if [ ! -f "$file" ]; then
        echo "usage: fcksum <file>"
        echo
        echo "<file> should be a regular file"
        echo
        exit 1
fi

backup=label.$file.`date  +%y%m%d_%H%M%S`
echo "Backing up original label in $backup"
dd if=$file of=$backup count=1 2>/dev/null

(
cat <<EOM
*0x1fe>/s/c
*0x1b8>/s/d
##(<c&0x8000)>t
<c&0x7fff>c
<d^0x8000>d
.,<t="Changing checksum"
0x1fe,<t/w <c
.,<t="Changing dummy field"
0x1b8,<t/w <d
.,<t="Label checksum has been updated"
.,#<t="Label checksum is okay"
EOM
) | mdb -w $file