I want to use Net::SSH::Expect in my unix box but unfortunately, it is not available and I am not able to convince the admin to install any perl module. Do you know how could I connect to a remote server using expect.
I know that I can archive that by using python but python is also not avai in my unix box.
Second attempt: though I use expect and shell scripting but the output is missing which is my original problem :Missing output when running system command
Please advise me any alternative module of Net::SSH::Expect so I can check its availibility in my unix box. Or any other way to connect remote server, execute some command and get the output ?
Million thanks.
You do not need your system administrator to install a module in order for you to run it. You can download and install it locally, and use local::lib to use it (as discussed in earlier questions on this site).
Alternatively, have you simply tried:
my $output = `ssh username#host command arguments`;
Related
I want to run a Perl script in a remote machine using telnet or ssh. The script is on my local host.how can do this. Can anyone please help me on this?
If you for some reason don't want to copy the script to the remote host and then run it, you can send the script to the Perl interpreter over stdin. If perl doesn't get either a script name of a script on the command line it tries to read the script on stdin. So this would work:
ssh user#remote perl < my_script.pl
Of course this requires that all necessary modules are already installed on the remote host. If you script only have pure perl dependencies you can work around this restriction by using App::FatPacker to make your script (more) self contained.
But if this is an recurring task I would recommend getting the script deployed correctly to your remote host.
scp your script to remote machine.
ssh user#remote 'perl /path/to/remote/script.pl'
Using HERE document across SSH might also do the trick you are after. You can run at least a BASH script without first separately copying it to remote. I have not verified anything else than BASH but no reason to doubt either. Please see:
ssh + here document + interactive mode
I'm trying to write a perl script that redirects its stdin to a remote machine and at the same time redirects the stdout of the remote machine to its stdout:
callingProgram <--> myScript <--> sshTunnelToRemote
See this question and bdonlan's answer for the purpose of the script.
First I tried to use the open2() function from the IPC library but for reasons described here it doesn't seem to be a good approach, I didn't even get a simple grep command working.
My second idea was to use the Net::SSH::Perl or the Expect libraries but they're not available on the machine where the script is supposed to be executed and I can't install libraries there.
So my question is what could be a simple way to achieve what I want? Solutions using [ba]sh or even C++ are also possible. The targeted platform is Solaris 10.
Seems like you could probably get away with nothing more than system() — don't pass the data from your stdin to ssh's stdin and from your stdout to ssh's stdout; just let ssh inherit your stdin and stdout. Unless you need to modify the data in transit somehow.
cpanminus can do this for you
Running:
cd ~/bin
curl -LO http://xrl.us/cpanm
chmod +x cpanm
Now you can try your problem using the right tools (e.g. Net::SSH::Perl).
The power of perl is cpan, and cpanminus gives you the ability to install whatever you need even if you don't have permission to install to the system-wide libraries.
Read the module documentation for the full details.
Need a way to have a perl script running on one machine run a perl script running on another.
The remote machine config is:
CentOS-5.5,
it's on the same network is the requesting machine,
has a DNS,
ports-open(SSH,HTTP)
Questions, feedback, comments -- just comment, thanks!!
Is this what you want?
system("ssh user#remotemachine perl <remote script's full path>");
will run the script on remote machine.
you may want to ssh without password, check: http://linuxproblem.org/art_9.html
As #Nylon Smile mentioned, you can use system to invoke the system's ssh client. If you want to do this without relying on external binaries (in particular because you want to handle password authentication differently), try Net::SSH::Perl, available from CPAN.
use Net::SSH::Perl;
my $ssh = Net::SSH::Perl->new('host');
$ssh->login('username', 'password');
my ($stdout, $stderr, $exit_code) = $ssh->cmd(
'perl some_script.pl --with=some_args',
'optionally, some stdin for that script'
);
Net::SSH::Perl can be a bit of a pain to install, but there are several other CPAN modules (most of which rely on an installed OpenSSH) and are a bit easier to deal with while providing a similar api. See also Net::SSH and Net::OpenSSH.
The above answers are fine for a one-off, but if you're doing this sort of thing a lot, you may want to look into some sort of messaging system like AMPQ (e.g. RabbitMQ) and set up queue listeners.
When you run swlist with no arguments on an HPUX system you get the packages that are installed on that particular host. I want that same output but instead listing packages that are installed on a different system.
Is this possible?
find $(perl -e 'print"#INC"') -name \*.pm
will get you most of the way there.
Try using Net::SSH::Expect to execute the swlist command on the remote host, grab the output and do what you want with it. That's what I would do.
I have a Perl script running on a Windows machine. I need this script to open a ssh session to a remote Unix machine, and to be able to execute certain commands on that Unix machine and to be able to get the output returned from these commands.
These commands are generated during the run-time of the script, and there are many of them executed at different times.
How can I do it?
Approach 1: Use CYGWIN: http://perlwin32ssh.blogspot.com/2007/07/test_4418.html
Approach 2: Use Net::SSH::W32Perl module.
This is one thread discussing how to install it: http://code.activestate.com/lists/perl-win32-users/29180/ (It seems to require downloading custom version of the module)
This thread should help with the problems arising from dependencies on math libraries needed for ssh calculations: http://www.issociate.de/board/post/494356/I%27m_trying_to_install_%27Net::SSH::Perl%27_on_a_Windows_Box..html
Caveat emptor: I never installed this, the above is just result of some analysis of google results.
#!/usr/bin/perl
system("ssh foo 'ls -l'");
Or go through the hassle of using ptmx(4) on the local side and ssh -t for remote.