This can be useful if the program connecting to the forwarded port doesn't allow you to change the port number it uses. This feature is available for local-to-remote forwarded ports; SSH-1 is unable to support it for remote-to-local ports, while SSH-2 can support it in theory but servers will not necessarily cooperate. Note that if you're using Windows XP Service Pack 2, you may need to obtain a fix from Microsoft in order to use addresses like A lot of Internet protocols are composed of commands and responses in plain text.
On Unix machines, you can do this using the system's telnet command to connect to the right port number. For example, telnet mailserver. Although the Unix telnet program provides this functionality, the protocol being used is not really Telnet. Really there is no actual protocol at all; the bytes sent down the connection are exactly the ones you type, and the bytes shown on the screen are exactly the ones sent by the server.
Unix telnet will attempt to detect or guess whether the service it is talking to is a real Telnet service or not; PuTTY prefers to be told for certain. You can then enter a host name and a port number, and make the connection. PuTTY can connect directly to a local serial line as an alternative to making a network connection. In this mode, text typed into the PuTTY window will be sent straight out of your computer's serial port, and data received through that port will be displayed in the PuTTY window.
You might use this mode, for example, if your serial port is connected to another computer which has a serial connection. After you start up PuTTY in serial mode, you might find that you have to make the first move, by sending some data out of the serial line in order to notify the device at the other end that someone is there for it to talk to. This probably depends on the device. If you start up a PuTTY serial session and nothing appears in the window, try pressing Return a few times and see if that helps.
A serial line provides no well defined means for one end of the connection to notify the other that the connection is finished. Therefore, PuTTY in serial mode will remain connected until you close the window using the close button. PuTTY can be made to do various things without user intervention by supplying command-line arguments e. If this syntax is used, settings are taken from the Default Settings see section 4.
Also, you can specify a protocol, which will override the default protocol see section 3. In order to start an existing saved session called sessionname , use the -load option described in section 3. If invoked with the -cleanup option, rather than running as normal, PuTTY will remove its registry entries and random seed file from the local machine after confirming with the user.
Note that on multi-user systems, -cleanup only removes registry entries and files associated with the currently logged-in user. PuTTY and its associated tools support a range of command-line options, most of which are consistent across all the tools. This section lists the available options in all tools. Options which are specific to a particular tool are covered in the chapter about that tool. The -load option causes PuTTY to load configuration details out of a saved session.
If these details include a host name, then this option is all you need to make PuTTY start a session. If you want to create a Windows shortcut to start a PuTTY saved session, this is the option you should use: your shortcut should call something like.
Note that PuTTY itself supports an alternative form of this option, for backwards compatibility. If you execute putty sessionname it will have the same effect as putty -load 'sessionname'. With the form, no double quotes are required, and the sign must be the very first thing on the command line. This form of the option is deprecated. These options are equivalent to the protocol selection buttons in the Session panel of the PuTTY configuration box see section 4.
Most of the PuTTY tools can be made to tell you more about what they are doing by supplying the -v option. If you are having trouble when making a connection, or you're simply curious, you can turn this switch on and hope to find out more about what is happening. You can specify the user name to log in as on the remote server using the -l option.
For example, plink login. These options are equivalent to the username selection box in the Connection panel of the PuTTY configuration box see section 4. As well as setting up port forwardings in the PuTTY configuration see section 4. The command-line options work just like the ones in Unix ssh programs. To forward a local port say to a remote destination say popserver. To forward a remote port to a local destination, just use the -R option instead of -L :. For this one you only have to pass the port number:.
However, the -m option expects to be given a local file name, and it will read a command from that file. With some servers particularly Unix systems , you can even put multiple lines in this file and execute more than one command in sequence, or a whole shell script; but this is arguably an abuse, and cannot be expected to work on all servers. The -P option is used to specify the port number to connect to.
If you have a Telnet server running on port of a machine instead of port 23, for example:. This option is equivalent to the port number control in the Session panel of the PuTTY configuration box see section 4. A simple way to automate a remote login is to supply your password on the command line. This is not recommended for reasons of security. If you possibly can, we recommend you set up public-key authentication instead. See chapter 8 for details. Note that the -pw option only works when you are using the SSH protocol.
Due to fundamental limitations of Telnet and Rlogin, these protocols do not support automated password authentication. The -agent option turns on SSH authentication using Pageant, and -noagent turns it off.
These options are only meaningful if you are using SSH. These options are equivalent to the agent authentication checkbox in the Auth panel of the PuTTY configuration box see section 4. The -A option turns on SSH agent forwarding, and -a turns it off. See chapter 9 for general information on Pageant, and section 9. Note that there is a security risk involved with enabling this option; see section 9. These options are equivalent to the agent forwarding checkbox in the Auth panel of the PuTTY configuration box see section 4.
These options are equivalent to the X11 forwarding checkbox in the X11 panel of the PuTTY configuration box see section 4. The -t option ensures PuTTY attempts to allocate a pseudo-terminal at the server, and -T stops it from allocating one.
To verify the signatures, you need the gpg tool. On Debian-based Linux, it can be installed with aptitude install gnupg. On Red Hat 7, it can be installed with yum install gnupg2. The installation package includes putty. It can also be used standalone, without the installation package, by simply copying the executable to a USB stick and running it on a new machine.
This way, the user can carry the executable with them. However, this should not be assumed to provide great security - malware on the machine where it is used can still compromise the software cf.
CIA hacking tool bothanspy and viruses may get installed on the USB stick whenever it is inserted in a new machine. See the separate puttygen page on how to create and set up SSH keys with it. It only works on the command line, and does not support graphically dragging and dropping files between systems. See Tectia SSH if you'd like that functionality. Keys are first created with puttygen.
Several more modern alternatives are available. The script will process all sub-folders below the specified parent source folder. EXE from Putty download page. Type pscp. How do I download a file in Unix? File transfer resume and more.
If you want to copy text within PuTTY, here are the steps you need to follow: Place the cursor near the text you want to copy and left-click. Hold the left mouse button, drag the cursor across the text, and then release the mouse button to copy.
Install Putty on Windows machine. Following are some useful ways to open a file from the terminal: Open the file using cat command.
Open the file using less command. Open the file using more command. Open the file using nl command. Open the file using gnome-open command.
Open the file using head command. Thank you. Save my name, email, and website in this browser for the next time I comment. Yes, add me to your new blog post notifications list. Terms of Service and other policies. Managed Solutions. SSL by brand. SSL by Type.
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