12-21-2012
Two ways.
1. Take the response header of the Webpage and look for the last modified time
2. If you are specific on what contents to be checked in the Web page[say for example a div part], download and cut that in a txt file and do a checksum with md5 or cksum to compare the change
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cksum(n) cksum cksum(n)
NAME
cksum - calculate a cksum(1) compatible checksum
SYNOPSIS
package require Tcl 8.2
package require cksum ?1.0?
::crc::cksum ?-format format? message
::crc::cksum ?-format format? -filename file
DESCRIPTION
This package provides a Tcl-only implementation of the cksum(1) algorithm based upon information provided at in the GNU implementation of
this program as part of the GNU Textutils 2.0 package.
COMMANDS
::crc::cksum ?-format format? message
::crc::cksum ?-format format? -filename file
The command takes string data or a file name and returns a checksum value calculated using the cksum(1) algorithm. The result is
formatted using the format(n) specifier provided or as an unsigned integer (%u) by default.
OPTIONS
-filename name
Return a checksum for the file contents instead of for parameter data.
-format string
Return the checksum using an alternative format template.
EXAMPLES
% crc::cksum "Hello, World!"
2609532967
% crc::cksum -format 0x%X "Hello, World!"
0x9B8A5027
% crc::cksum -file cksum.tcl
1828321145
SEE ALSO
sum(n), crc32(n)
AUTHORS
Pat Thoyts
KEYWORDS
cksum, checksum, crc, crc32, cyclic redundancy check, data integrity, security
crc 1.0 cksum(n)