You may be talking about line numbers in a text editor used to edit Perl scripts. If that's the case, you're asking a broad question because we have no idea what code editor you're using (and since it's not a Perl topic we probably don't much care).

Or you may be asking how to determine what line number you've just read out of a file. If that's the case, the "$." special variable will tell you what line number you're reading. See perlvar for details.

Or you may be asking how to determine what line in your script is currently executing. If that's the case, the __LINE__ tag will tell you. You can print __LINE__, "\n";, for example. See perldata for details about the __LINE__ "Special Literal".

Or if you just want to know how many lines there are in a file.... well, here's a Perl solution: 

perl -n -e "END { print $., "\n"; }" file.txt

[download]


Dave

In reply to Re: Display Line Numbers by davido
in thread Display Line Numbers by Anonymous Monk

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.