I need to get the first two fields of a log file containing a certain string starting from the end of the file. Using this I get the whole last line line containing the string: 
$ perl -ne '$l=$_ if /received/; END{print $l}' /var/log/rsync.log
2017/04/20 10:50:24 [26050] sent 25 bytes  received 326 bytes  total s
+ize 52165551

[download]
How could I get the date fields (2017/04/20 10:50:24)? Right now I have this: 
 perl -ne '$l=$_ if /received/; END{print $l}; ($date) = $1 =~ m/^(\d+
+\/\d+\/\/d+) .*/g ; print $date, " \n" ' /var/log/rsync.log

[download]
Which should at least get me '2017/04/20' (just starting with the regex), but I get nothing back in $date, just the original line. Is it possible to achieve in a oneliner, or do I need to write a proper script? TIA.

EDIT: Thanks a lot for your solutions. The autosplit switch is really handy.

In reply to one liner question by natxo

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.