#!/bin/sh
SELECTION=$1
SELECTION2=$2
NOW=$(date +%s)
DAYS="${SELECTION:=30}"
PLAYLIST="${SELECTION2:=monthly.m3u}"

MATHISHARD=$(( $NOW - ( $DAYS * 86400 ) ))
TIMESTAMP=$(date -r $MATHISHARD +%Y-%m-%d)

mpc -f %file% search "(added-since '$TIMESTAMP')" > $PLAYLIST