Посты

🔰 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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📦 Exercise Files

📂 Full description

Earning the Red Hat Certified Engineer (RHCE) certification-the benchmark certification for Red Hat Enterprise Linux (RHEL)-demonstrates to both your current organization and potential employers that you possess expert-level competence with RHEL. This course covers authentication with LDAP and Kerberos as part of RHCE certification prep. Join instructor and Linux enthusiast Grant McWilliams as he discusses using Network Time Protocol (NTP) for authentication, as well as configuring an NTP server and client. Grant also explains how to set up a Lightweight Directory Access Protocol (LDAP) server and client, and how to configure Kerberos client authentication.

📱Linux and DevOps
📱Linux System Engineer: Authentication with LDAP and Kerberos