Unix Arithmatic operation issue , datatype issue - Page 2

otheus · #1 (**permalink**) 02-13-2008

Quote:

Originally Posted by thambi

When I run the below command

awk '{ print $0 " +\\" }' hash_column_wrong.txt | bc

I got below exception..

bundling space exceeded on line 1,
bundling space exceeded on line 1,
bundling space exceeded on line 1,

is it due to \n character that occurs end of the line?.

Sounds like bc can't handle the huge line size. try this:

Code:

awk '{ print "last + " $0  }' hash_column_wrong.txt | bc  | tail -1

This prints out a sub-result for each line. The only catch is that "last" is a GNU extension.

otheus · #2 (**permalink**) 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.

thambi · #3 (**permalink**) 02-13-2008

Sorry, I have not worked on Perl scripting.. it's new to me... I feel GNU bc method will be ok for me.. if you guide me the installation way, i can probably try with that method.....

thambi · #4 (**permalink**) 02-13-2008

And also I have just found that my machine is 64 bit..

$ getconf KERNEL_BITS
64

now is there anyway to get my result?

otheus · #5 (**permalink**) 02-13-2008

Quote:

Originally Posted by thambi

And also I have just found that my machine is 64 bit..

$ getconf KERNEL_BITS
64

now is there anyway to get my result?

Depends on if the programs are compiled in 64-bit. Try

Code:

file `which bc` `which awk` `which perl`

Is it a 64-bit or 32-bit executable? (You might have to find the paths manually).

For installing bc, you'll have to go to the home page, whose link I provided, and follow the steps. You'll probably need the sysadmin's help, but in theory, you can do something like:

Code:

gunzip -c gbc-*tgz | tar xf - 
cd gbc????
./configure --prefix=$HOME
make install

thambi · #6 (**permalink**) 02-13-2008

I got the below result...

$ file `which bc` `which awk` `which perl`
/usr/bin/bc: PA-RISC1.1 shared executable dynamically linked
/usr/bin/awk: PA-RISC1.1 shared executable dynamically linked
/usr/bin/perl: PA-RISC1.1 shared executable dynamically linked -not stripped
$

Meantime, I just waiting for my Unix admin's response to install GNU bc. If i install GNU bc, current version bc will be affected. I mean GNU bc having all the features ?

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