Question

I’m writing a simple batch downloader for files, which have the format Y-m-d.pdf. I want to pass the dates (from, to) as a parameter, e.g.:

./download.sh 2012-01-01 2012-01-31

That should download all files for January 2012.

Here’s what I got so far:

#!/bin/bash

for i in {0..9}
do
    curl -u user:pw http://server/path/somescript.pl?date=`date -v-"$i"d +%Y-%m-%d` -o `date -v-"$i"d +%Y-%m-%d`.pdf
done

This downloads the ten most recent files.

EDIT: How can I iterate over a range of dates instead? Something like:

for d in {2012-01-01..2012-03-31}

I was hoping for a built-in feature, otherwise I would need to take care of the number of days in each month (not to forget leap years) myself.

Answer 1

The following shows the basic idea, you have to put the curl stuff in for yourself:

START=`date -j -f %Y-%m-%d:%H.%M $1:0.0 +%s`
END=`date -j -f %Y-%m-%d:%H.%M $2:0.0 +%s`
for (( i=$START; i<=$END; i+=86400 )); do # seconds/day
   echo `date -j -f %s "$i" +%Y-%m-%d`
done;  

If you call it:

> ./range 2012-1-30 2012-2-4
2012-01-30
2012-01-31
2012-02-01
2012-02-02
2012-02-03
2012-02-04