You say you do the system command, but you aren't saying when. Considering you're opening several files (and without actually checking whether the open succeeds), it does matter.

Your sed command seems to be correct - when running it from the command like it does what you think it should do.

Of course, I would have written the entire thing in Perl: 

use 5.010;
open my $in, "<", "sesip1" or die;
open my $out, ">", "sesip2" or die;
my @lines = <$in>;
chomp @lines;
{
    local $" = " ";
    say $out "dest (@lines)";
}
close $out or die;

[download]

In reply to Re: why does 'sed' remove the entire line? by JavaFan
in thread why does 'sed' remove the entire line? by ddrew78

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.