(cLive ;-)(Golf) Analyzing Time From tcpdump Output

                          123456789          2         3         4
% cat data.output | perl -p0e'/(\d+\.\d+).*(\d+\.\d+)/s;$_=$2-$1.$:'
[download]

I added a closing CR because output doesn't display otherwise (at least not for my install :) - without it, it's 39

cLive ;-)

update - as chipmunk points out, this fails. In my effort to fp a reply, I missed out the : , ie:

% cat data.output | perl -p0e'/(\d+\.\d+).*:(\d+\.\d+)/s;$_=$2-$1.$:'
[download]

Shame on y'all who ++d my reply :)

Comment on (cLive ;-)(Golf) Analyzing Time From tcpdump Output Select or Download Code

Replies are listed 'Best First'.
Re: (cLive ;-)(Golf) Analyzing Time From tcpdump Output by chipmunk (Parson) on Feb 05, 2002 at 03:43 UTC
I'm afraid your solution has a bug; the greedy matching of .* means that $2 only contains one of the digits before the decimal point, rather than both. Here's another way to match: `perl -lp0e'/([\d.]{9}).*([\d.]{9})/s;$_=$2-$1'` Using -l is shorter than using $:, and avoids outputting a spurious '-' after the newline. :)	[reply] [d/l]
(cLive ;-)(Golf) Analyzing Time From tcpdump Output by cLive ;-) (Prior) on Feb 05, 2002 at 07:45 UTC
Are you sure? Try running it... :) The \d+ is greedy too... cLive ;-)	[reply]
Re: (cLive ;-)(Golf) Analyzing Time From tcpdump Output by chipmunk (Parson) on Feb 05, 2002 at 16:00 UTC
Yes, I am sure. I did run it, and it output the wrong answer: `-49.994325 -` [download] It doesn't matter that \d+ is greedy, because .* is greedy and gets to go first. The .* only backtracks far enough to allow the \d+ to match. \d+ can match a single digit, so .* only gives up a single digit. But to get the correct answer, \d+ has to match two digits before the decimal point, not one. On the other hand, it's okay if $2 only contains one digit before the decimal point, if $1 also contains a single digit before the decimal point: `perl -lp0e'/(\d\.\d+).*(\d\.\d+)/s;$_=$2-$1'`	[reply] [d/l] [select]
Re: (cLive ;-)(Golf) Analyzing Time From tcpdump Output by petral (Curate) on Feb 05, 2002 at 15:38 UTC
Or `perl -lp0e's/\S:(\S+).:..:(\S+).*/$2-$1/es' data.output` [download] TIMTOWTDI: `perl -lpe'$b=(split":")[2];$a\|\|=$b}{$_=$b-$a' data.output` [download] p	[reply] [d/l] [select]