The ultimate Putty guide: Using Putty for SSH

Master Putty settings for SSH: Learn advanced putty settings and save profiles for quick access to your Linux servers

PuTTY is a free and open-source terminal emulator, serial console and network file transfer application. It supports several network protocols, including SCP, SSH, Telnet, rlogin, and raw socket connection. It can also connect to a serial port. The name "PuTTY" has no definitive meaning.

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PuTTY was originally written for Microsoft Windows, but it has been ported to various other operating systems. Official ports are available for some Unix-like platforms, with work-in-progress ports to Classic Mac OS and macOS, and unofficial ports have been contributed to platforms such as Symbian, Windows Mobile and Windows Phone.

PuTTY supports many variations on the secure remote terminal, and provides user control over the SSH encryption key and protocol version, alternate ciphers such as 3DES, Arcfour, Blowfish, DES, and Public-key authentication. It also can emulate control sequences from xterm, VT102 or ECMA-48 terminal emulation, and allows local, remote, or dynamic port forwarding with SSH (including X11 forwarding). The network communication layer supports IPv6, and the SSH protocol supports the zlib@openssh delayed compression scheme. It can also be used with local serial port connections.

PuTTY comes bundled with command-line SCP and SFTP clients, called "pscp" and "psftp" respectively, and plink, a command-line connection tool, used for non-interactive sessions.

PuTTY consists of several components:

PuTTY: the Telnet, rlogin, and SSH client itself, which can also connect to a serial port
PSCP: an SCP client, i.e. command-line secure file copyPSFTP: an SFTP client, i.e. general file transfer sessions much like FTPPuTTYtel: a Telnet-only clientPlink: a command-line interface to the PuTTY back ends
Pageant: an SSH authentication agent for PuTTY, PSCP and Plink
PuTTYgen: an RSA, DSA, ECDSA and EdDSA key generation utility
pterm: a standalone terminal emulator