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This is a list of POSIX (Portable Operating System Interface) commands as specified by IEEE Std 1003.1-2024, which is part of the Single UNIX Specification (SUS). These commands can be found on Unix operating systems and most Unix-like operating systems.
Secure Shell (SSH) is a protocol allowing secure remote login to a computer on a network using public-key cryptography.SSH client programs (such as ssh from OpenSSH) typically run for the duration of a remote login session and are configured to look for the user's private key in a file in the user's home directory (e.g., .ssh/id_rsa).
SSH is typically used to log into a remote computer's shell or command-line interface (CLI) and to execute commands on a remote server. It also supports mechanisms for tunneling , forwarding of TCP ports and X11 connections and it can be used to transfer files using the associated SSH File Transfer Protocol (SFTP) or Secure Copy Protocol (SCP).
This output would be produced by a ssh-keygen -r host.example.com. command on the target server by reading the existing default SSH host key (Ed25519). [ 5 ] With the OpenSSH suite, the ssh-keyscan utility can be used to determine the fingerprint of a host's key; using the -D will print out the SSHFP record directly.
Linux HP-UX iOS Maemo macOS Solaris OpenSSH [b] The OpenBSD project 1999-12-01 [c] AIX 9.9 [6] 2024-09-19 BSD: Android BSD Cygwin Linux HP-UX iOS Maemo OpenVMS macOS Solaris Windows z/OS PuTTY: Simon Tatham: 1999-01-22 BSD 0.83 [7] 2025-02-08 MIT: Linux macOS Solaris Windows SecureCRT: VanDyke Software 1998–06 Linux 9.3.1 [8] 2022-12-06 ...
The operating systems or virtual machines the SSH servers are designed to run on without emulation; there are several possibilities: . No indicates that it does not exist or was never released.
OpenSSH (also known as OpenBSD Secure Shell [a]) is a suite of secure networking utilities based on the Secure Shell (SSH) protocol, which provides a secure channel over an unsecured network in a client–server architecture.
The System Security Services Daemon (SSSD) is software originally developed for the Linux operating system (OS) that provides a set of daemons to manage access to remote directory services and authentication mechanisms. [1] The beginnings of SSSD lie in the open-source software project FreeIPA (Identity, Policy and Audit). [2]