Is there any methods to read from a FILE_HANDLER line by line instead of reading till the end of file?

To read from a filehandle a single line at a time, simply do so in scalar context.

my $line = <STDIN>;

[download]

will read a single line from STDIN. Note: "Line" is defined based on the value in $/. This defaults to "newline" which is defined based on the operating system perl is running under. If you wish to controll the character which is used to determine what is the end of a "line" you can set $/ (however this should be done in limited scope, probably via local).

May the Force be with you

In reply to Re^3: Read from a Linux pipe hangs. by JediWizard
in thread Read from a Linux pipe hangs. by dmor4477

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.