root/floppyfw/files/passwd.sh

#!/bin/sh

PW_F=./passwd
PW_L=13

PW="$1"

[ "$PW" ] || {
        echo "E: need a passwd argument"
        exit 1                                          
}

[ ${#PW} -eq $PW_L ] || {
        echo "E: passwd argument length must be $PW_L"
        exit 1
}

# tweak the passwd file with fall back, in case of a problem ;-)
mv $PW_F $PW_F.old
if sed -e "s,^\(root\):[^:]*:\(.*\)$,\1:$PW:\2," $PW_F.old > $PW_F
then
        rm -f $PW_F.old
else
        mv $PW_F.old $PW_F
fi

exit 0