How to fetch specific data from a file.? Post: 302998306

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Top Forums UNIX for Beginners Questions & Answers How to fetch specific data from a file.? Post 302998306 by Don Cragun on Tuesday 30th of May 2017 01:02:16 AM

05-30-2017

Registered User

Quote:

Originally Posted by scriptor

hi rudic

it works but how should I incorporate in script.

I am explaining my requirement as below.

Code:

 
 i have a file called vsy.txt.0 and vsy.txt.1
i need the data of day -1 but the day -1 data is present in 2 files which is vsy.txt.0 and vsy.txt.1
also file is getting updated at every 10 sec.
 what i need here is to sum the received count for 1 hr and save in a file.
in this way i can have a 24 entry on houry basis for received message .

---------- Post updated at 05:50 PM ---------- Previous update was at 01:04 PM ----------

please help me in this

It is hard to follow what you are doing. You say that you have one file with two names (vsy.txt.0 and vsy.txt.1) and that this file is updated every 10 seconds.

Is one of these files a symbolic link pointing to the other file? Are both files hard linked? If it is one file, why does it matter to your script which name is used?

How is the file being updated? Are the contents overwritten every 10 seconds? Is text appended to your file every 10 seconds?

If you just want a count of records added every hour and text is being appended to your file, why not just wait until the next day after all of the updates have been received and process your file once?

If you don't give us a clear description of what your computing environment is, what input file(s) you have, the format of that file (or those files) is, the format of the output you want, and sample input files and corresponding sample output that want to extract that the sample input, there is little incentive for the volunteers reading your post to try to guess at what you are trying to do and guess at something the stands very little chance of actually meeting your unspecified requirements.

With what you have told us, why doesn't running the code RudiC suggested every 10 seconds after your file has been updated give the the results you want until the day is done?

Don Cragun

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bomstrip

BOMSTRIP(1)						    BSD General Commands Manual 					       BOMSTRIP(1)

NAME

     bomstrip, bomstrip-files -- strip the BOM sequence from UTF-8 files

SYNOPSIS

     bomstrip
     bomstrip-files file ...

DESCRIPTION

     The bomstrip utility reads UTF-8 data from its standard input and copies it to its standard output, stripping the BOM (byte-order mark) from
     the beginning of the text if it is present.  There are no command-line options and no parameters.

     The bomstrip-files utility removes the UTF-8 BOM from the specified files, saving each file's original contents with a .bom extension.  It
     uses the bomstrip utility, trying to execute it as ``bomstrip''; if the bomstrip utility is installed under another name, or if a more com-
     plex command is desired, it may be supplied in the BOMSTRIP environment variable.

EXAMPLES

     Strip the BOM, if present, from a text file:

	   bomstrip < bom.txt > nobom.txt

     Strip the BOM, if present, from all text files, backing them up with a .bom extension:

	   bomstrip-files *.txt

     Use the OCAML implementation of bomstrip:

	   env BOMSTRIP='ocaml bomstrip.ocaml' bomstrip-files *.txt

SEE ALSO

     The bomstrip home page: http://www.xs4all.nl/~mechiel/projects/bomstrip/

HISTORY

     The bomstrip utility (in many languages) was written by Mechiel Lukkien, with implementations in various languages sent to him by others,
     including Andreas Gohr, Andrew Gerrand, Berteun Damman, Matthijs Bomhoff, Peter Pentchev, and Ruben Smelik.  The bomstrip-files utility and
     this manual page were written by Peter Pentchev in the hope that they reflect the behavior of all the bomstrip implementations in all lan-
     guages.

AUTHORS

     Mechiel Lukkien <mechiel@xs4all.nl>
     Peter Pentchev <roam@ringlet.net>

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