Script to record a stream at specific times

record.sh

#!/bin/sh

if [ "$#" != 4 ] ; then
    echo "Usage: $0 <url> <filename> <starttime> <endtime>"
    exit 1
fi

URL="$1"
FILENAME="$2"
STARTTIME="$3"
ENDTIME="$4"

at $STARTTIME <<-FIN
    #wget "$URL" -O"$FILENAME" &
    mplayer "$URL" -vo null -ao null -dumpstream -dumpfile "$FILENAME" &
    PID="\$!"
    echo kill "\$PID" | at "$ENDTIME"
FIN