If I just use once sysread to try, it is still empty. Here is the code, what is wrong in the code?
my $cmd = '/opt/rssh/bin/ssh';
my $machine = "remote_machine";
open(my $fh, "-|", "$cmd $machine \"hostname;sleep 5;uptime\" 2>&1") o
+r die "cannot open fh";
my $flags = fcntl($fh, F_GETFL, 0) or die "\ncan't get flags for the p
+ipe: $!\n";
fcntl($fh, F_SETFL, $flags | O_NONBLOCK) or die "\ncan't set flags: $!
+\n";
my $out = $fh;
my $bytes_read = -1;
my $blocksize = 1024;
my $result = "";
my $buf;
$bytes_read = sysread($out, $buf, $blocksize);
print "\nl buf content is:\n $buf \n";
close $out;
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|