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Secure Shell (SSH) is a protocol for securely operating network services over an unsecured network. It uses public-key cryptography to authenticate the remote computer and the user, and supports remote login, command-line execution, tunneling, and file transfer.
OpenSSH is a cross-platform suite of programs that provide a secure channel over an unsecured network using the SSH protocol. It is developed as part of the OpenBSD operating system and has various features such as encryption, authentication, port forwarding and more.
Bash is a free software shell program and command language for Unix-like operating systems, developed by Brian Fox for the GNU Project. It supports interactive and non-interactive modes, shell scripts, various features and extensions, and is widely used as the default login shell for Linux distributions and macOS.
A table of notable SSH clients with their general name, developer, initial release, platform, license, GUI, version, date and features. Bitvise SSH Client is a proprietary Windows program that supports SSH1 and SSH2 protocols and additional features such as port forwarding, SFTP and proxy client.
Operating systems, like all software, may contain bugs in need of fixing or may be enhanced with the addition of new features; many UNIX systems come with a package manager for this. Patching the operating system in a secure manner requires that the software come from a trustworthy source and not have been altered since it was packaged.
A Unix shell is a program that executes other programs in response to text commands and provides a command line user interface for Unix-like operating systems. Learn about the history, features and types of Unix shells, such as sh, csh, bash, zsh and more.
Learn what a shell is in computing, how it exposes an operating system's services to a user or other programs, and how it can be command-line or graphical. Explore the history of shells from Multics to Unix to Windows, and the features and examples of different shells.
A shell script (or job) can report progress of long running tasks to the interactive user. Unix/Linux systems may offer other tools support using progress indicators from scripts or as standalone-commands, such as the program "pv". [52] These are not integrated features of the shells, however.