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Full Discussion: Help with Perl script that can check a URL and notifiy when changes occur
Top Forums Shell Programming and Scripting Help with Perl script that can check a URL and notifiy when changes occur Post 302725685 by DGPickett on Friday 2nd of November 2012 01:26:24 PM
Old 11-02-2012
There are already free web sites that do that for you and send an email.

I would wget into cksum and save the cksum, size and url in a sorted file. Make a new sorted file on the next pass and compare files using "comm -13 old new | while read cksum sz url ;do ... done". Add files with a 0 length and 0 cksum, and the next pass will update them, but sensing a pair of zeros, it knows to not notify.
 

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LEARN ABOUT REDHAT

cksum

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)
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