As juerd already said: It depends.

but then there is also the possibility to bendchmark your script in order to find out what's faster on YOUR system. You will have to benchmark again if you change the system.

In general: I would go the second way and not rely on any external grep-command to exist. The problems with them are, as far as I can see:

  1. Is it in the PATH?
  2. If not, what's it's path?
  3. If it is, is it safe to assume that it is always the same grep you call? (some other earlier in the path at some later time)
  4. How does that grep evaluate it's parameters?
  5. How to escape meta characters?
  6. What are the meta characters?
  7. ...

In reply to Re: What is faster? by Skeeve
in thread What is faster? by hotshot

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


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.