SSH(3pm)						User Contributed Perl Documentation						  SSH(3pm)

NAME

       Net::SSH - Perl extension for secure shell

SYNOPSIS

	 use Net::SSH qw(ssh issh sshopen2 sshopen3);

	 ssh('user@hostname', $command);

	 issh('user@hostname', $command);

	 ssh_cmd('user@hostname', $command);
	 ssh_cmd( {
	   user => 'user',
	   host => 'host.name',
	   command => 'command',
	   args => [ '-arg1', '-arg2' ],
	   stdin_string => "string
",
	 } );

	 sshopen2('user@hostname', $reader, $writer, $command);

	 sshopen3('user@hostname', $writer, $reader, $error, $command);

DESCRIPTION

       Simple wrappers around ssh commands.

       For an all-perl implementation that does not require the system ssh command, see Net::SSH::Perl instead.

SUBROUTINES

       ssh [USER@]HOST, COMMAND [, ARGS ... ]
	   Calls ssh in batch mode.

       issh [USER@]HOST, COMMAND [, ARGS ... ]
	   Prints the ssh command to be executed, waits for the user to confirm, and (optionally) executes the command.

       ssh_cmd [USER@]HOST, COMMAND [, ARGS ... ]
       ssh_cmd OPTIONS_HASHREF
	   Calls ssh in batch mode.  Throws a fatal error if data occurs on the command's STDERR.  Returns any data from the command's STDOUT.

	   If using the hashref-style of passing arguments, possible keys are:

	     user (optional)
	     host (requried)
	     command (required)
	     args (optional, arrayref)
	     stdin_string (optional) - written to the command's STDIN

       sshopen2 [USER@]HOST, READER, WRITER, COMMAND [, ARGS ... ]
	   Connects the supplied filehandles to the ssh process (in batch mode).

       sshopen3 HOST, WRITER, READER, ERROR, COMMAND [, ARGS ... ]
	   Connects the supplied filehandles to the ssh process (in batch mode).

EXAMPLE

	 use Net::SSH qw(sshopen2);
	 use strict;

	 my $user = "username";
	 my $host = "hostname";
	 my $cmd = "command";

	 sshopen2("$user@$host", *READER, *WRITER, "$cmd") || die "ssh: $!";

	 while (<READER>) {
	     chomp();
	     print "$_
";
	 }

	 close(READER);
	 close(WRITER);

FREQUENTLY ASKED QUESTIONS

       Q: How do you supply a password to connect with ssh within a perl script using the Net::SSH module?

       A: You don't (at least not with this module).  Use RSA or DSA keys.  See the
	  quick help in the next section and the ssh-keygen(1) manpage.

       A #2: See Net::SSH::Expect instead.

       Q: My script is "leaking" ssh processes.

       A: See "How do I avoid zombies on a Unix system" in perlfaq8, IPC::Open2, IPC::Open3 and "waitpid" in perlfunc.

GENERATING AND USING SSH KEYS

       1 Generate keys
	   Type:

	      ssh-keygen -t rsa

	   And do not enter a passphrase unless you wanted to be prompted for one during file copying.

	   Here is what you will see:

	      $ ssh-keygen -t rsa
	      Generating public/private rsa key pair.
	      Enter file in which to save the key (/home/User/.ssh/id_rsa):
	      Enter passphrase (empty for no passphrase):

	      Enter same passphrase again:

	      Your identification has been saved in /home/User/.ssh/id_rsa.
	      Your public key has been saved in /home/User/.ssh/id_rsa.pub.
	      The key fingerprint is:
	      5a:cd:2b:0a:cd:d9:15:85:26:79:40:0c:55:2a:f4:23 User@JEFF-CPU

       2 Copy public to machines you want to upload to
	   "id_rsa.pub" is your public key. Copy it to "~/.ssh" on target machine.

	   Put a copy of the public key file on each machine you want to log into.  Name the copy "authorized_keys" (some implementations name
	   this file "authorized_keys2")

	   Then type:

		chmod 600 authorized_keys

	   Then make sure your home dir on the remote machine is not group or world writeable.

AUTHORS

       Ivan Kohler <ivan-netssh_pod@420.am>

       Assistance wanted - this module could really use a maintainer with enough time to at least review and apply more patches.  Or the module
       should just be deprecated in favor of Net::SSH::Expect or made into an ::Any style compatibility wrapper that uses whatver implementation
       is avaialble (Net::SSH2, Net::SSH::Perl or shelling out like the module does now).  Please email Ivan if you are interested in helping.

       John Harrison <japh@in-ta.net> contributed an example for the documentation.

       Martin Langhoff <martin@cwa.co.nz> contributed the ssh_cmd command, and Jeff Finucane <jeff@cmh.net> updated it and took care of the 0.04
       release.

       Anthony Awtrey <tony@awtrey.com> contributed a fix for those still using OpenSSH v1.

       Thanks to terrence brannon <tbone@directsynergy.com> for the documentation in the GENERATING AND USING SSH KEYS section.

COPYRIGHT

       Copyright (c) 2004 Ivan Kohler.	Copyright (c) 2007-2008 Freeside Internet Services, Inc.  All rights reserved.	This program is free
       software; you can redistribute it and/or modify it under the same terms as Perl itself.

BUGS

       Not OO.

       Look at IPC::Session (also fsh, well now the native SSH "master mode" stuff)

SEE ALSO

       For a perl implementation that does not require the system ssh command, see Net::SSH::Perl instead.

       For a wrapper version that allows you to use passwords, see Net::SSH::Expect instead.

       For another non-forking version that uses the libssh2 library, see Net::SSH2.

       For a way to execute remote Perl code over an ssh connection see IPC::PerlSSH.

       ssh-keygen(1), ssh(1), IO::File, IPC::Open2, IPC::Open3

perl v5.10.0							    2008-05-14								  SSH(3pm)