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finding # of lines changed..

nipper

Trying to produce a list (order of magnitude) how many lines of a text file are different from one version to another.

Checking the man page for iwrcsdiff and iwdiff does not look like an easy solution. My current choice is iwrcsdiff blah | wc -l, then divide by 2. Gives a larger number, but in the order of magnitude. Any better options.

TIA

Andy

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Comments

Adam Stoller

Not a complete answer - but I think if you use: iwdiff -w -b -B -d -n file1 file2 that you'll get a streamlined version of ed commands to effect the changes in file1 from file2 (or vice versa?) - you can then process the output with something like (UNTESTED):

my $add = 0;
my $del = 0;
foreach (@output){
    if(/^a\s+\S+\s+(\d+)$/){
        $add += $1;
    }
    elsif (/^d\s+\S+\s+(\d+)$/){
        $del += $1;
    }
}
$total_changed = $add + $del;
print "$add + $del = $total_changed\n";

--fish
Senior Consultant, Quotient Inc.
http://www.quotient-inc.com

nipper

Thanks fish,

Here is what I ended up with:

$file=shift;

$command = qq(iwrcsdiff -Bwbnd "$file");
@output=`$command`;
my $add = 0;
my $del = 0;
foreach (@output) {
if (/^a(\d+)\s+(\d+)$/){
$lastadd=$1;
if ($lastadd ne $lastdel ){
$add += $2;}}
elsif (/^d(\d+)\s+(\d+)$/){
$lastdel=$1;
if ($lastadd ne $lastdel ){
$del += $2;}}
}
$total_changed = $add+$del;
print "$add + $del = $total_changed\n";

iwrcsdiff was showing 2 changes per line (add and delete)
for a modify, thus the lastadd and last delete check.

format was:

d## # (delete starting at $1, $2 lines)
a## # (add to line $1, $2 lines)
<SOME CHANGE>

Andy

Adam Stoller

Cool - Sorry about the incorrect formatting in the regex - I thought there was another space there. I'm not sure how much reliance to place on lastadd and lastdel, since the line numbers will likely deviate - but if it looks correct from your testing that's good enough for me ;-)

And the number you get back should be much more accurate that your previous suggestion of iwrcdiff | wc -l / 2....

--fish
Senior Consultant, Quotient Inc.
http://www.quotient-inc.com