#! /bin/sh

db=$1; shift
text=$1

lc () {
    printf "%s" "$1" | tr A-Z a-z
}

sender=$(lc "$sender")
if [ -f $db/$sender ]; then
    echo "Welcome back, $sender.  Your messages:"
    cat $db/$sender
    rm $db/$sender
fi

case "$text" in 
    note\ *)
        args=${text#note }
        who=$(lc "${args%% *}")
        what=${args#* }
        when=$(date)
        
        echo "($when) <$prefix> $what" >> $db/$who
        echo "Okay, $sender, I've left $who a note."
        ;;
esac