Jon Doe

Cron is the standard Linux job scheduler. It runs commands or scripts at specified times and intervals. Open the Crontab Editor crontab -e Cron Syntax # m h dom mon dow command 0 2 * * * /usr/bin/backup.sh This runs the script every day at 2:00 AM. Common Examples # Every 5 minutes */5 * * * * /usr/bin/check.sh # Every Monday at midnight 0 0 * * 1 /usr/bin/weekly.sh View Scheduled Jobs crontab -l

Managing storage devices is a core Linux administration skill. This guide covers identifying, formatting, and mounting drives on any Linux distribution. List Available Drives lsblk sudo fdisk -l Format a Partition sudo mkfs.ext4 /dev/sdb1 Mount the Drive sudo mkdir /mnt/data sudo mount /dev/sdb1 /mnt/data Persist Mount on Boot Add to /etc/fstab : /dev/sdb1 /mnt/data ext4 defaults 0 2

UFW (Uncomplicated Firewall) is the default firewall tool for Ubuntu. It simplifies iptables configuration with an easy command-line interface. Install and Enable UFW sudo apt install ufw sudo ufw enable Allow Common Services sudo ufw allow ssh sudo ufw allow http sudo ufw allow https Check Status sudo ufw status verbose Block a Specific IP sudo ufw deny from 192.168.1.100

Password-based SSH login is vulnerable to brute-force attacks. SSH key authentication is faster and significantly more secure. Generate a Key Pair ssh-keygen -t ed25519 -C "[email protected]" Copy the Public Key to the Server ssh-copy-id user@server-ip Disable Password Login Edit /etc/ssh/sshd_config and set: PasswordAuthentication no PubkeyAuthentication yes Then restart SSH: sudo systemctl restart sshd

LAMP (Linux, Apache, MySQL, PHP) is a classic web server stack. This guide installs and configures all four components on Ubuntu 22.04 LTS. Install Apache sudo apt update sudo apt install apache2 Install MySQL sudo apt install mysql-server sudo mysql_secure_installation Install PHP sudo apt install php libapache2-mod-php php-mysql Test the Setup Create a test file at /var/www/html/info.php with <?php phpinfo(); ?> and open it in your browser.

BitLocker encrypts your entire drive to protect data from unauthorized access. This guide walks through enabling BitLocker on Windows 10 and 11 Pro editions. Requirements A TPM 1.2 or later chip is required (or you can enable software-based encryption via Group Policy). Enable BitLocker Open Control Panel > System and Security > BitLocker Drive Encryption and click Turn on BitLocker next to your drive. Save Your Recovery Key Store the recovery key in a safe place — without it you cannot access your data if you…

PowerShell provides powerful cmdlets for managing Windows services — starting, stopping, querying status, and configuring startup type. List All Services Get-Service Start and Stop a Service Start-Service -Name "wuauserv" Stop-Service -Name "wuauserv" Change Startup Type Set-Service -Name "Spooler" -StartupType Disabled Find Services by Status Get-Service | Where-Object { $_.Status -eq "Running" }

Creating a local user account allows someone to use your PC without a Microsoft account. Follow these steps to add a new user in Windows 10. Via Settings Go to Settings > Accounts > Family & other users and click Add someone else to this PC . Choose I don't have this person's sign-in information , then Add a user without a Microsoft account . Via Command Prompt net user NewUsername StrongPassword /add net localgroup Administrators NewUsername /add

Windows Defender Firewall controls which network traffic is allowed in and out of your system. This guide explains how to create inbound and outbound rules using the GUI and netsh. Open the Advanced Firewall Console Run wf.msc from the Run dialog to open the Windows Defender Firewall with Advanced Security console. Create an Inbound Rule Click Inbound Rules > New Rule . Choose Port, set TCP/UDP and the port number, then choose Allow or Block. netsh advfirewall firewall add rule name="Block Port 8080" protocol=TCP…

Windows Task Scheduler lets you automate scripts, programs, and maintenance jobs on a time-based or event-based trigger. This guide covers creating a basic scheduled task from the GUI and from PowerShell. Create a Task via GUI Open Task Scheduler from the Start menu. Click Create Basic Task and follow the wizard to set a trigger (Daily, Weekly, etc.) and action (Start a Program). Create a Task via PowerShell $action = New-ScheduledTaskAction -Execute "powershell.exe" -Argument "-File C:scriptsackup.ps1" $trigger…