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The magic SysRq key is a key combination understood by the Linux kernel, which allows the user to perform various low-level commands regardless of the system's state. It is often used to recover from freezes , or to reboot a computer without corrupting the filesystem . [ 1 ]
ssh-agent creates a socket and then checks the connections from ssh. Everyone who is able to connect to this socket also has access to the ssh-agent. The permissions are set as in a usual Linux or Unix system. When the agent starts, it creates a new directory in /tmp with restrictive permissions. The socket is located in this directory.
On March 29, 2024, a serious supply chain attack on XZ Utils has been reported, targeting indirectly the OpenSSH server (sshd) running on Linux. The OpenSSH code is not directly concerned, the backdoor is caused by the dependencies on liblzma via libsystemd applied by a tierce patch, applied by various Linux distributions. [citation needed]
PuTTY user manual (copy from 2022) PuTTY (/ ˈ p ʌ t i /) [4] 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.
SSH is a protocol that can be used for many applications across many platforms including most Unix variants (Linux, the BSDs including Apple's macOS, and Solaris), as well as Microsoft Windows. Some of the applications below may require features that are only available or compatible with specific SSH clients or servers.
Due to these problems, the r-commands fell into relative disuse (with many Unix and Linux distributions no longer including them by default). Many networks that formerly relied on rlogin and telnet have replaced them with SSH and its rlogin-equivalent slogin. [21] [22]
Furthermore, the value "~" as a terminal name with username "shutdown" or "reboot" indicates a system shutdown or reboot (respectively). [2] These files are not set by any given PAM module (such as pam_unix.so or pam_sss.so) but are set by the application performing the operation (e.g. mingetty, /bin/login, or sshd). As such it is the ...
An SSH server is a software program which uses the Secure Shell protocol to accept connections from remote computers. SFTP / SCP file transfers and remote terminal connections are popular use cases for an SSH server.