... why perl is not complaining with an error regarding a statement like "$m=($1,$2,$3,$4,$5,$6,$7)",

The following set of statements are syntactically correct: 

Win8 Strawberry 5.8.9.5 (32)  Mon 09/21/2020 19:49:29
C:\@Work\Perl\monks
>perl
use strict;
use warnings;

my $foo = 42;
my $bar = 137;

my $m;
$m = (1, 2, 3, $foo, 5, 6, $bar);
Useless use of a constant in void context at - line 8.
Useless use of a constant in void context at - line 8.
Useless use of private variable in void context at - line 8.
Useless use of a constant in void context at - line 8.
Useless use of a constant in void context at - line 8.
print $m;

__END__
137

[download]
(1, 2, 3, $foo, 5, 6, $bar) is a list. Evaluating a list in scalar context (which is imposed by assignment to the scalar $m) causes the evaluation of every expression in the list, with only the result of the evaluation of the last item ($bar in this case) being returned. All other results are thrown away, which is why you see all the "Useless use of..." warnings — not errors! See the article Context tutorial in the Monastery's Tutorials section.

Give a man a fish:  <%-{-{-{-<

In reply to Re^2: Need advice in for perl use as awk replacement by AnomalousMonk
in thread Need advice in for perl use as awk replacement 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.