If I could ++ 10 times that mention of grep -F -f..., I would.

I didn't know about that grep option.

For the perl approach, depending on the number of "serials", Regex::PreSuf might be able to turn @serials into one regex, which would likely be very ugly, but likely faster.

However, it's likely to be impossible to beat doing the grep -F -f and then post-processing the results file to split into separate serial files - for example, if the serial column is easily found, the sort program could sort the result by serial #, making the split very simple.

For bulk applications, /usr/bin/grep and /usr/bin/sort can sometimes beat perl's speed by large margins, so it's worth trying them.


Mike

In reply to Re^2: System Call for various serials in a for loop by RMGir
in thread System Call for various serials in a for loop by Elbarto

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.