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SSH (Secure Shell) Command Guide
SSH (Secure Shell) is a network protocol that allows secure access to remote computers and the execution of commands. It provides data security through encrypted communication and is used for various purposes such as remote server management and file transfer. Use this guide to learn about the main features and usage of SSH.
ssh-add: Add SSH Keys to the Agent
The ssh-add command adds private keys (identities) to the OpenSSH authentication agent (ssh-agent). This allows for automatic authentication during SSH connections without repeatedly entering passwords or passphrases, thereby enhancing security and improving SSH usability.
ssh-agent: SSH Authentication Agent
ssh-agent is a program that loads your private SSH keys into memory and handles authentication for SSH clients when connecting to remote servers, eliminating the need to repeatedly enter passwords or passphrases. This significantly enhances the security and convenience of SSH connections.
ssh-copy-id: Copy SSH Public Key
The ssh-copy-id command is a utility that easily and securely adds your local system's SSH public key to the authorized_keys file on a remote server. This allows you to set up passwordless SSH connections and reduces errors that can occur during manual key copying.
ssh-keygen: Generate and Manage SSH Key Pairs
ssh-keygen is a utility used to generate, manage, and convert OpenSSH authentication key pairs (public and private keys). It is a core tool for securely connecting to remote servers via SSH or authenticating with services like Git.
ssh-keyscan: Collect SSH Host Keys
A utility to collect the public host keys of SSH servers. The collected keys are added to the `~/.ssh/known_hosts` file, allowing SSH clients to verify the server's identity when connecting. This plays a crucial role in preventing Man-in-the-Middle attacks.
ssh-scan: SSH Server Security Scanner
ssh-scan is a tool that analyzes the security settings of SSH servers, checking supported encryption algorithms, key exchange methods, host keys, and identifying potential vulnerabilities. It is useful for security audits and hardening.
sshd: OpenSSH Daemon
sshd is the OpenSSH server daemon, providing secure, encrypted communication for remote systems. It listens for connection requests from SSH clients, handles user authentication and session management, enabling features like remote logins, file transfers (SCP, SFTP), and port forwarding.
sshfs: Mount Remote File Systems via SSH
sshfs is a client that allows you to mount a directory from a remote server onto your local file system using the SSH File Transfer Protocol. This enables you to browse and edit remote files as if they were on a local disk. It operates based on FUSE (Filesystem in Userspace).
stat: Display file status in a user-defined format
The `stat` command displays detailed status information about a file or file system. In particular, using the `-c` (or `--format`) option allows you to extract file size, permissions, owner, time information, and more in a user-specified format, making it very useful for scripting and report generation.
strace: System Call and Signal Tracer
strace is a powerful diagnostic tool for Linux that traces and records the system calls (syscalls) made by a process and the signals it receives. It allows you to understand in detail how a program interacts with the kernel, making it useful for debugging, performance analysis, and security auditing.
strings: Extracting Strings from Binary Files
The `strings` command is a tool used to extract human-readable text strings from binary files (executables, libraries, etc.). It is useful for debugging programs, analyzing malware, or quickly checking the content of unknown files.