caffeine
Prevent the computer screen and system from falling asleep on macOS or Windows. Use when the user wants to keep their display awake, disable sleep, or run a long task without interruption.
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소스 지침 · 읽기 전용 미리보기- name
- caffeine
- description
- Prevent the computer screen and system from falling asleep on macOS or Windows. Use when the user wants to keep their display awake, disable sleep, or run a long task without interruption.
# 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
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