Beefy Boxes and Bandwidth Generously Provided by pair Networks
good chemistry is complicated,
and a little bit messy -LW

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
hi gurus,

I wonder that's a simple question,but i can't find a better way.I have a log file as below:
timestamp description timestamp description .........
Now, I need to print all description after some timestamp.
below is my code:
..... while (<>) { print if timestamp>threshold; }
my question: I don't wanna compare timestamp every loop,because log file is sorted by timestamp.That is,if one timestamp is greater than threshold, print the rest of all (no comparison). How can do that?

all reply would be appreciated!

Thanks for your help to let me know my stupidity!In fact,my question is:
how traverse a large sorted(indexed) file faster?
According to your reply,I have three way to do it:
1. flipflop operator
2. binary seek
3. Tie::File (array)
which one is the best? I think nobody but benchmark module could answer it. :-)
Thanks again!

In reply to print log file by xiaoyafeng

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others chanting in the Monastery: (2)
As of 2021-10-22 01:40 GMT
Find Nodes?
    Voting Booth?
    My first memorable Perl project was:

    Results (85 votes). Check out past polls.