Question

#!/bin/bash

HEAD=`curl -sIX HEAD http://gert.iriscouch.com/www/test`
echo "$HEAD"
if [[ $HEAD =~ Etag:\ \"(.*)\" ]]; then
 echo "${BASH_REMATCH[1]}"
fi

HEAD=`curl -sIX HEAD http://gert.iriscouch.com/www/test/user.png`
echo "$HEAD"
if [[ $HEAD =~ Etag:\ \"(.*)\" ]]; then
 echo "${BASH_REMATCH[1]}"
fi

On the second HEAD it does not match the Etag?

HTTP/1.1 200 OK
Server: CouchDB/1.1.0 (Erlang OTP/R14B03)
Etag: "2-bd7278b9cc8b0ddaf7c863102f42f246"
Date: Thu, 01 Sep 2011 19:47:02 GMT
Content-Type: text/plain;charset=utf-8
Content-Length: 207
Cache-Control: must-revalidate

2-bd7278b9cc8b0ddaf7c863102f42f246

HTTP/1.1 200 OK
Server: CouchDB/1.1.0 (Erlang OTP/R14B03)
ETag: "2-bd7278b9cc8b0ddaf7c863102f42f246"
Date: Thu, 01 Sep 2011 19:47:03 GMT
Content-Type: image/png
Content-MD5: SS+3YnbRbRQ4uiJKcnFkdA==
Content-Length: 4003
Cache-Control: must-revalidate
Accept-Ranges: bytes

Answer 1

The case is different.

if [[ $HEAD =~ Etag:\ \"(.*)\" ]]; then


Etag: "2-bd7278b9cc8b0ddaf7c863102f42f246"

ETag: "2-bd7278b9cc8b0ddaf7c863102f42f246"

use

if [[ $HEAD =~ [Ee][Tt][Aa][Gg]:\ \"(.*)\" ]]; then

I hope this helps