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Full Discussion: Compare two md5sum
Top Forums Shell Programming and Scripting Compare two md5sum Post 302981048 by Don Cragun on Tuesday 6th of September 2016 10:09:14 PM
Old 09-06-2016
Asking questions is not an insult! We are here to help you learn how to use the tools available on your system. And, your attempt was very close to working. There were only two small problems:
  1. you can't assign a value to a positional parameter using $2=string, and
  2. you need to use a $ to expand the contents of a shell variable.
So, if you change your script to something more like:
Code:
#!/bin/bash
last_checksum=52f8422918c5347166dbb40c76f95e9c

checksum=`curl --silent httptheurliwanttocheck | md5sum`

if [ "$last_checksum" = "$checksum" ]
then
    echo "nothing"
else
    echo "change"
fi

You should get the results you want when you run your script. The backquotes you are using for command substitution are obsolescent. The preferred method would be:
Code:
checksum=$(curl --silent httptheurliwanttocheck | md5sum)

but either form will work for now.

If that works for you, you can then think about replacing the echo "change" with a command to send yourself mail. But, unless you are scheduling this script to run when you're are there to see the results, there isn't any reason to do that.
This User Gave Thanks to Don Cragun For This Post:
toscan
 

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LEARN ABOUT DEBIAN

gst-md5sum

gst-md5sum-0.8(1)						   User Commands						 gst-md5sum-0.8(1)

NAME

       gst-md5sum-0.8, gst-md5sum - get an md5sum of a GStreamer pipeline through md5sink

SYNOPSIS

       gst-md5sum-0.8 [--verbose] [gst-std-options] [partial-pipeline-description]

       gst-md5sum [--verbose] [gst-std-options] [partial-pipeline-description] [--gst-list-mm] [--gst-mm=string] [--print]

DESCRIPTION

       gst-md5sum-0.8 generates MD5 checksums of the data generated by a GStreamer pipeline.

       In theory, both of the following commands should print out the same checksum:

       gst-md5sum-0.8 filesrc location=music.mp3

       md5sum music.mp3

       If  the	pipeline  contains  an md5sink element, gst-md5sum-0.8 queries it for the md5sum at the end of pipeline iteration. If the pipeline
       does not contain an md5sink element, gst-md5sum-0.8 automatically connects an md5sink to the right-hand side of the given pipeline.

       See gst-launch(1) or the GStreamer documentation for more information on how to create a partial-pipeline-description.

       gst-md5sum is a wrapper script that runs the latest installed version of gst-md5sum-X.X. For  example,  if  both  gst-md5sum-0.7  and  gst-
       md5sum-0.8 are installed on your system, gst-md5sum runs gst-md5sum-0.8.

OPTIONS

       The following options are supported by gst-md5sum-0.8 and gst-md5sum:

       --verbose       Output verbose information. You can also use -v to specify this option.

       gst-std-options Standard options available for use with most GStreamer applications.  See gst-std-options(5) for more information.

       The following options are supported by gst-md5sum only:

       --gst-list-mm   List found major/minor versions. This option displays the versions that are available.

       --gst-mm=string Force  major/minor  version.  This  option  enables you to specify a specific version to run, if you do not want to run the
		       default version.

       --print	       Print wrapped command line. This option displays the command that will be run, and then runs the command.

OPERANDS

       The following operands are supported:

       partial-pipelinePartialppipeline description.

EXAMPLES

       Example 1: Running the Wrapper Script and Displaying the Command Name

       example% gst-md5sum --print
       /usr/bin/gst-md5sum-0.8

FILES

       The following files are used by this application:

       /usr/bin/gst-md5sum-0.8 Executable for GNOME help browser

       /usr/bin/gst-md5sum     Wrapper script that runs the latest installed version of gst-md5sum-X.X

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWgnome-media		   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |External			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       gst-complete(1), gst-compprep(1), gst-feedback(1), gst-inspect(1),  gst-launch(1),  gst-launch-ext(1),  gst-register(1),  gst-thumbnail(1),
       gst-typefind(1), gst-xmlinspect(1), gst-xmllaunch(1), gstreamer-properties(1), libgstreamer-0.8(3), libgstgetbits(3), gst-std-options(5)

NOTES

       Original man page written by the GStreamer team at http://gstreamer.net/.

       Updated by Brian Cameron, Sun Microsystems Inc., 2004.

SunOS 5.10							    14 Oct 2004 						 gst-md5sum-0.8(1)
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