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Full Discussion: Unix Arithmatic operation issue , datatype issue
Top Forums Shell Programming and Scripting Unix Arithmatic operation issue , datatype issue Post 302167017 by otheus on Wednesday 13th of February 2008 09:23:23 AM
Old 02-13-2008
Quote:
Originally Posted by thambi
a=2147483647
expr $a + 2

for this i need to get the right result rather than -ve value.
I'm on a 64-bit machine, and awk and Perl seem to work fine here. I don't have access to a 32-bit machine at the moment. But try it with perl:

Code:
#!/usr/bin/env perl -w
$bc_lines=100;

local $maxint=int(2*(2**30 - 1)+1);
my $a=0;
my @subresults;

while ($_=<>) {
  chop;
  if ($maxint - int($_) < $a) {
    push @subresults, $a;
    $a=0;
  }
  $a+=int($_);
}
while (scalar(@subresults)) {
  print join("+\\\n",splice(@subresults,0,$bc_lines),"0\n");
}

Now run this script, pipe through bc *recursively* until there is only one line left. For example:

Code:
cp bigfile.txt outfile.txt 
while [ ! -f outfile.txt -o `grep -c ^ outfile.txt` -gt 1 ]; do 
  perl test.pl  outfile.txt  |bc >outfile.$$ ; 
  mv outfile.$$ outfile.txt; 
  echo "Subcalc complete" >&2; 
done ; 
cat outfile.txt

If bc complains with the same error, lower 100 to, say, 50. Keep cutting in half till no more complaints.

the GNU bc link is in my previous post.
 

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LEARN ABOUT CENTOS

bf_tar

BF_TAR(1)						    Bogofilter Reference Manual 						 BF_TAR(1)

NAME

       bf_tar - shell script to write a tar file of a bogofilter directory to stdout

SYNOPSIS

       bf_tar [-r] [-R] bogofilter_directory

DESCRIPTION

       bf_tar bundles a bogofilter working directory in tar format and copies it to standard output (your console, or where you redirect it, see
       EXAMPLES below).

OPTIONS

       The -r option causes bf_tar to remove inactive log files after the archive has been written successfully. The default is to leave log
       files.

       The -R option causes bf_tar to remove inactive log files before the archive is written. This may reduce chances that the resulting archive
       is recoverable should it become damaged. The archive may be smaller though. The default is to leave log files.

EXIT STATUS

       The script exits with status code 0 if everything went well, and nonzero if it encountered trouble.

EXAMPLES

       o   bf_tar ~/.bogofilter > outfile.tar

	   Writes a standard .tar file containing the essential files from ~/.bogofilter to outfile.tar.

       o   bf_tar ~/.bogofilter | gzip -9 -c > outfile.tar.gz

	   Writes a gzipped .tar.gz file containing the essential files from ~/.bogofilter to outfile.tar.gz.

       o   bf_tar `pwd`/mydirectory > outfile.tar

	   Prepend $(pwd)/ or `pwd`/ if you want to specify an absolute path instead of a relative path.

NOTES

       This script is meant for use with Berkeley DB based bogofilter versions.

       This script requires a SUSv2 compliant pax utility.

       This script expects a SUSv2 compliant shell. Solaris systems should have the SUNWxcu4 package installed (when bogofilter is configured) so
       that /usr/xpg4/bin/sh can be used.

AUTHORS

       Matthias Andree

Bogofilter							    10/22/2012								 BF_TAR(1)
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