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Add Prevent Sleep With The Caffeinate Command as a Mac TIL

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jbranchaud
2025-11-09 13:50:03 -05:00
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README.md
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For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186). For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
_1681 TILs and counting..._ _1682 TILs and counting..._
See some of the other learning resources I work on: See some of the other learning resources I work on:
@@ -710,6 +710,7 @@ If you've learned something here, support my efforts writing daily TILs by
- [Keyboard Shortcuts For Interesting With Text Areas](mac/keyboard-shortcuts-for-interacting-with-text-areas.md) - [Keyboard Shortcuts For Interesting With Text Areas](mac/keyboard-shortcuts-for-interacting-with-text-areas.md)
- [List All The Say Voices](mac/list-all-the-say-voices.md) - [List All The Say Voices](mac/list-all-the-say-voices.md)
- [Open Finder.app To Specific Directory](mac/open-finder-app-to-specific-directory.md) - [Open Finder.app To Specific Directory](mac/open-finder-app-to-specific-directory.md)
- [Prevent Sleep With The Caffeinate Command](mac/prevent-sleep-with-the-caffeinate-command.md)
- [Quickly Type En Dashes And Em Dashes](mac/quickly-type-en-dashes-and-em-dashes.md) - [Quickly Type En Dashes And Em Dashes](mac/quickly-type-en-dashes-and-em-dashes.md)
- [Require Additional JS Libraries In Postman](mac/require-additional-js-libraries-in-postman.md) - [Require Additional JS Libraries In Postman](mac/require-additional-js-libraries-in-postman.md)
- [Resize App Windows With AppleScript](mac/resize-app-windows-with-applescript.md) - [Resize App Windows With AppleScript](mac/resize-app-windows-with-applescript.md)

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mac/prevent-sleep-with-the-caffeinate-command.md Normal file
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# Prevent Sleep With The Caffeinate Command
MacOS has a built-in utility `caffeinate` that can programatically prevent your
machine from sleeping. There are two kinds of sleep that it can prevent via
_assertions_.
> caffeinate creates assertions to alter system sleep behavior.
The two kinds of sleep behavior are _display sleep_ and _system idle sleep_. An
assertion to prevent display sleep can be created with `-d` and system idle
sleep with `-i`.
We can combine those to prevent both and then specify a duration (_timeout_)
with `-t` (with a value in seconds).
```bash
caffeinate -d -i -t 600
```
This creates assertions with 10 minute timeouts for both display and system idle
sleep.
The `caffeinate` command is blocking, so if you want to start it in the
background, you can do that like so:
```bash
caffeinate -d -i -t 600 &
```
See `man caffeinate` for more details.