Linux and DevOps

🔰 Linux Command Cheat Sheet File Commands - ls - Directory listing - ls -l - Long listing format - ls -a - List all files including hidden files - cd /path/to/directory - Change directory - pwd - Display the current working directory - mkdir directory_name - Create a new directory - rmdir directory_name - Remove an empty directory - rm file_name - Remove a file - rm -r directory_name - Remove a directory and its contents recursively - touch file_name - Create or update a file - cat file_name - Concatenate and display the file content - more file_name - View file content page by page - less file_name - Improved viewing of file content over more - cp source_file target_file - Copy files from source to target - mv old_name new_name - Rename or move a file/directory SSH (Secure Shell) - ssh user@host - Connect to host as user - ssh -p port user@host - Connect using a specific port - ssh-keygen -t rsa - Generate RSA key pair - ssh-copy-id user@host - Copy your key to the remote server for password-less login Searching - grep pattern files - Search for a pattern in files - grep -r pattern dir - Recursively search for a pattern in a directory - find dir -name name* - Find files starting with name in a directory - locate file_name - Find files by name (uses a database) Process Management - ps aux - Display your currently active processes - ps aux | grep process_name - Find a process named process_name - top - Display all running processes - kill pid - Kill a process with a given PID - killall process_name - Kill all processes named process_name - bg - List stopped or background jobs; resume a stopped job in the background - fg - Bring the most recent job to the foreground File Permissions - chmod +x file_name - Make a file executable - chmod 755 file_name - Set read and execute permissions for owner and read for others - chown user:group file_name - Change file owner and group Networking - ifconfig - Display all network interfaces and IP addresses - ping host - Send ICMP echo request to host - traceroute host - Display the route packets take to a network host - netstat -tulnp - Display listening ports and their applications Archiving and Compression - tar cf archive_name.tar files - Create a tar archive containing files - tar xf archive_name.tar - Extract files from a tar archive - gzip file_name - Compress a file and rename it to file.gz - gunzip file.gz - Decompress file.gz back to the original System Info and Management - uname -a - Show system and kernel info - df -h - Display free disk space in a human-readable form - du -sh directory_name - Show disk usage of a directory in human-readable form - free -m - Show free and used memory in MB Misc Commands - man command_name - Show manual for a command - echo "text" - Display a message on the screen - date - Display the current date and time - uptime - Show how long the system has been running

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