perl -ne "$. ==1 and print;" filename.txt

[download]
perl -e "print scalar <>;" filename.txt

[download]
perl -ne "print and last;" filename.txt

[download]
perl -ne "last; END{print}" filename.txt

[download]
perl -ne "die $_;" filename.txt

[download]
perl -pe "$. > 1 and last;" filename.txt

[download]

Some will be more efficient than others.

The point is that if all you need to print is the first line, you should probably terminate reading the file once you've read the first line.


Dave

In reply to Re: Printing a line only if first line of file by davido
in thread Printing a line only if first line of file by Win

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.