dates-of-year.sh

#!/bin/sh
# usage: ./date_of_year.sh [ {year} ]

year=$1
if test -z "$year"; then
    year=`date +'%Y'`
fi
next_year=`echo "$year + 1" | bc`
now=`date +"%Y-%m-%d" -d "$year-01-01"`
end=`date +"%Y-%m-%d" -d "$next_year-01-01"`;
while [ "$now" != "$end" ]; do
    week=`date +"%a" -d "$now"`
    echo "$now,$week"
    now=`date +"%Y-%m-%d" -d "$now + 1 day"`
done