I ran your code from the command line and it did not throw any error, and it even correctly reported all three hosts as up. But then I got the idea that maybe there is a file ship.cfg in your current directory (which you did not mention but which I should have caught sooner). Taint mode regards input from local files as tainted (see perldoc perlsec or the perldoc online page). So you will need to untaint that data manually. I chose the sledgehammer approach to untainting:

if ( -e "ship.cfg" ) {
        open (CFGFILE, "<", "ship.cfg") || die;
        @hosts=<CFGFILE>;
        close (CFGFILE);
        # untaint all data from ship.cfg
        @hosts = map { /^(.*)$/ and $1 } @hosts;
} else {
        # Enter your hosts here...
        @hosts = qw/host1 host2 host3 aliens/;
}

[download]

But I would recommend hardcoding all hosts in the script instead, as that will be much more secure than reading in a file and pinging every host named in that file.

In reply to Re^7: using -T doesn't work by Corion
in thread using -T doesn't work by tcf03

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.