Re: parse output and check if a change

From:

Daniel Pitts <newsgroup.nospam@virtualinfinity.net>

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 07 Mar 2013 16:59:56 -0800

Message-ID:

<gKa_s.227841$411.112277@newsfe02.iad>

On 3/7/13 11:10 AM, mike wrote:

Hi,

I am sending a command to unix and then I parse the output. The output is stored in a Info object ( Info.java). This will be used later in application.

The problem is that the output from the unix command might change. So I want to make sure that if there is a change then we parse and update the Info object. But if there is no change then we do not need to parse and extract the information. We can use the Info object directly.

The idea I have is to use the output from the command ( a text string) and calculate some kind of hash/md5sum.

So the next time I run the unix command I take the output (a string) and calculate hash/md5 and see if it is an exact match as was generated the first time.

Anyone will to give a hint on how to implememt this using java?

br,

//mike

So, you're going to run a process every time (which is expensive), and
then avoid parsing the result (which is likely far less expensive) if
the output doesn't change?

Is there perhaps a better way to get this Info that doesn't involve
running an external program?