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Full Discussion: Need help to write a Perl script
Top Forums Shell Programming and Scripting Need help to write a Perl script Post 302177870 by user_prady on Sunday 23rd of March 2008 11:33:14 PM
Old 03-24-2008
Bug
Quote:
Originally Posted by era
The logic is a bit hard to follow. Could you post a sample input and sample output for that?

I would start by refactoring your script based on the following observations;

* the "if" has only an "else" clause. It would seem more natural to invert the test and have only a "then" clause.

* Perl can easily convert hex to binary, and generally between different number bases, so that part of the script is easy to simplify. But you are not using the value of $binary anywhere?

Code:
open(IN, $file)|| die("Could not open file: $!");
while(<IN>) {
 unless (/^["*]/) {
   @fld = split(/,/, $_);
   if( $fld[3] == 1 ){
          print $_;
          $binary1 = HexToBinary(substr($fld[0],0,2));
          print $_;
	  # do you mean
	  # $first = $binary1 . substr($fld[0],2);
          # shift @fld
          # print join ("," $first, @fld)
          # ?
    }
  }
}
sub HexToBinary{
    my $hex = $h;
    return sprintf "%b", hex($h);
}


Thank you all for your kind reply.

Era sorry for not sending my whole goal and code.

Here it goes...Its a FPGA test pattern .But I think I cant send all my constarints at once.

Input
Code:
"RxData","Time","NSysClkEn"
000000,0000,1,0,0,0,0,0,0
000000,0000,0,0,0,0,0,0,0
*Comment Control Frame at 10 us
000000,030C,0,0,0,0,1,0,1
241000,0000,0,1,3,0,0,0,0
000100,0000,0,0,2,0,0,0,0
*Comment Control Frame at 65 us
000000,13CE,0,0,0,0,1,0,1
000200,0000,0,1,2,0,0,0,0

*Main Start
*Comment Frame 2 at 1.04167 us
000000,2451,0,0,0,0,1,0,1
A8F9FF,0000,0,1,3,0,0,0,0
9F999F,0000,0,0,3,0,0,0,0
FFF9FF,0000,0,0,3,0,0,0,0
F9FF9F,0000,0,0,3,0,0,0,0
999DF3,0000,0,0,3,0,0,0,0
73BDF5,0000,0,0,3,0,0,0,0
D5FDF5,0000,0,0,3,0,0,0,0
5FD9B5,0000,0,0,3,0,0,0,0
1BB3BB,0000,0,0,3,0,0,0,0
7DF97D,0000,0,0,3,0,0,0,0
3BDDDB,0000,0,0,3,0,0,0,0
*Main End

Constraints:
Code:
1.dont process lines starting with lines " (double quotes)and  * (astris)
2.Prints the lines starting with * as it is. 
3.if the fourth field is "1" then take the fist two digits of the first field and then convert it to binary.
   checks the binary no with a look up table.
4.prints the second field in decimal when field 9th and 7th are "1".

For the time being I am explananing that much when I ll archive that goal in Perl I ll explain further friends.

Regards,
user_prady
 

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LEARN ABOUT DEBIAN

pperl

PPERL(1p)						User Contributed Perl Documentation						 PPERL(1p)

NAME

       PPerl - Make perl scripts persistent in memory

SYNOPSIS

	 $ pperl foo.pl

DESCRIPTION

       This program turns ordinary perl scripts into long running daemons, making subsequent executions extremely fast. It forks several processes
       for each script, allowing many processes to call the script at once.

       It works a lot like SpeedyCGI, but is written a little differently. I didn't use the SpeedyCGI codebase, because I couldn't get it to
       compile, and needed something ASAP.

       The easiest way to use this is to change your shebang line from:

	 #!/usr/bin/perl -w

       To use pperl instead:

	 #!/usr/bin/pperl -w

WARNINGS

       Like other persistent environments, this one has problems with things like BEGIN blocks, global variables, etc. So beware, and try checking
       the mod_perl guide at http://perl.apache.org/guide/ for lots of information that applies to many persistent perl environments.

Parameters
	 $ pperl <perl params> -- <pperl params> scriptname <script params>

       The perl params are sent to the perl binary the first time it is started up.  See perlrun for details.

       The pperl params control how pperl works. Try -h for an overview.

       The script params are passed to the script on every invocation. The script also gets any current environment variables, the current working
       directory, and everything on STDIN.

Killing
       In order to kill a currently running PPerl process, use:

	 pperl -- -k <scriptname>

       You need to make sure the path to the script is the same as when it was invoked.

       Alternatively look for a .pid file for the script in your tmp directory, and kill (with SIGINT) the process with that PID.

ENVIRONMENT

       pperl uses the PPERL_TMP_PATH environment variable to determine the directory where to store the files used for inter-process
       communication.  By default, the subdirectory .pperl of the user's home directory is used.

BUGS

       The process does not reload when the script or modules change.

       $^S is not represented identically with respect to perl, since your script will be run within an eval block

AUTHOR

       Matt Sergeant, matt@sergeant.org. Copyright 2001 MessageLabs Ltd.

SEE ALSO

       perl. perlrun.

perl v5.14.2							    2011-11-15								 PPERL(1p)
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