Net::SSH2 related query

nithins has asked for the wisdom of the Perl Monks concerning the following question:

Hi monks

i am using windows locally , i wanted to ssh to linux server & run some command and get the output back.For this i wrote a script but it doesn't seems to be working as i expected.It authenticates that i logged in to server but how to get the output back. i googled a lot but found no success

#!/usr/bin/perl
use strict;
use warnings;
use Net::SSH2;
use File::Remote;

my $user = '';
my $pass ="";
#my $cmd = "ls";


my %host; 
$host{'portaltest'} = "";
$host{'opatest'} = "";

eval{

foreach my $key (keys(%host)){
my $ssh = Net::SSH2->new();
    $ssh->connect($host{$key});
    $ssh->auth_password($user, $pass) or die "not able to login\n";
    print "password authenticated\n" if ($ssh->auth_ok());
    
my $chan = $ssh->channel();
    $chan->blocking(0);
        $chan->shell();
    $chan->write("ls");
    print "ls command executed\n";
    select(undef,undef,undef,0.2);
    my $buf;
    print $buf while defined (my $len = $chan->read($buf,512));
    # print "ls printing\n";
    $chan->close();
    
    }
    
};

warn $@ if $@;
[download]

Comment on Net::SSH2 related query Download Code

Replies are listed 'Best First'.
Re: Net::SSH2 related query by salva (Canon) on Nov 19, 2013 at 13:47 UTC
Net::SSH::Any builds on top of Net::SSH2 and is quite easier to use: `my $ssh = Net::SSH::Any->new($host, user => $user, password => $pass, +backends => 'Net::SSH2'); my $output = $ssh->capture("ls"); print "output:\n$output";` [download]	[reply] [d/l]
Re: Net::SSH2 related query by lune (Pilgrim) on Nov 19, 2013 at 12:48 UTC
Cannot test that at the moment, but the write to the channel should need a trailing newline. so `... $chan->write("ls\n"); ...` [download] Also see here: A little demo for Net::SSH2	[reply] [d/l]
Re: Net::SSH2 related query by keszler (Priest) on Nov 19, 2013 at 14:21 UTC
`... print $chan "ls\n"; my @response = (readline $chan);` [download]	[reply] [d/l]
Re^2: Net::SSH2 related query by nithins (Sexton) on Nov 20, 2013 at 06:26 UTC
I used your code , but the print statement didn't print results of "ls command". however when i run the script in debugg mode i found "@respose" having results of "ls"	[reply]
Re^3: Net::SSH2 related query by lune (Pilgrim) on Nov 20, 2013 at 14:40 UTC
Just tried again to reproduce your error. First, I am getting the same result (nothing read), if I set the timeout in the select-function too low, say `#select(undef,undef,undef,0.2); select(undef,undef,undef,0.001);` [download] Maybe You should try a higher one? Second, it seems, that readline (or <>) is always able to read from the channel (no select necessary). The below code works for me. For you too? `my $chan = $ssh->channel() or die "create channel:$!\n"; $chan->shell() or die("open shell: $!\n"); $chan->blocking(0); $chan->write("ls\n") or die("write to channel: $!\n"); while ( <$chan> + ) { print $_; }` [download]	[reply] [d/l] [select]
Re^3: Net::SSH2 related query by keszler (Priest) on Nov 20, 2013 at 14:33 UTC
In `print $chan "ls\n";`, $chan is like a filehandle (`open FH, '>', 'file.txt'; print FH "something\n";`). The print command sends the characters over the SSH connection to the shell on the other end.	[reply] [d/l] [select]
Re: Net::SSH2 related query by nithins (Sexton) on Nov 19, 2013 at 13:20 UTC
Tried that($chan->write("ls\n");), but it didn't work	[reply]
Re^2: Net::SSH2 related query by lune (Pilgrim) on Nov 19, 2013 at 14:21 UTC
Strange, just tried it for logging in from some ubuntu VM to another linux box which didn't work without newline and worked with the change. Could you add some additional error handling for all channel operations and show me the error ($!)?	[reply]


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