caffeine

# Caffeine Keeps your computer awake by preventing display and system sleep. ## Quick Start ### macOS ```bash caffeinate -d ``` ### Windows (PowerShell) ```powershell # Keep display awake until Ctrl+C while ($true) { $wsh = New-Object -ComObject WScript.Shell $wsh.SendKeys('{SCROLLLOCK}{SCROLLLOCK}') Start-Sleep -Seconds 60 } ``` --- ## macOS Uses the built-in `caffeinate` command (no installation needed). ### Options | Command | Effect | |---------|--------| | `caffeinate` | Prevent sleep until terminated | | `caffeinate -d` | Prevent **display** from sleeping | | `caffeinate -i` | Prevent **idle** sleep | | `caffeinate -s` | Prevent **system** sleep (AC power only) | | `caffeinate -t 3600` | Prevent sleep for 1 hour (seconds) | | `caffeinate -d -t 1800` | Keep display on for 30 minutes | ### Examples Keep display on for 2 hours: ```bash caffeinate -d -t 7200 ``` Keep awake while a command runs: ```bash caffeinate -i -- long-running-command ``` Run in background: ```bash caffeinate -d & # To stop later: pkill caffeinate ``` Check if running: ```bash pgrep -l caffeinate ``` --- ## Windows ### Option 1: PowerShell (no install) Prevent sleep by simulating activity (Ctrl+C to stop): ```powershell while ($true) { $wsh = New-Object -ComObject WScript.Shell $wsh.SendKeys('{SCROLLLOCK}{SCROLLLOCK}') Start-Sleep -Seconds 60 } ``` ### Option 2: powercfg (change power settings) Disable sleep temporarily: ```powershell # Disable sleep on AC power powercfg /change standby-timeout-ac 0 powercfg /change monitor-timeout-ac 0 # Re-enable later (e.g., 30 minutes) powercfg /change standby-timeout-ac 30 powercfg /change monitor-timeout-ac 15 ``` ### Option 3: Presentation mode ```powershell # Enable presentation mode (disables sleep + notifications) presentationsettings /start # Disable when done presentationsettings /stop ``` ### Option 4: One-liner with .NET ```powershell # Prevent sleep for duration of script Add-Type -AssemblyName System.Windows.Forms while ($true) { [System.Windows.Forms.Cursor]::Position = [System.Windows.Forms.Cursor]::Position Start-Sleep -Seconds 60 } ``` --- ## Notes - **macOS**: `caffeinate` is built-in; process must stay running - **Windows**: PowerShell methods simulate activity; `powercfg` changes system settings - Press **Ctrl+C** to stop any running script