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Operating_Systems/Devices.md
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Devices are hardware that require access to the CPU in order to function. Devices can either be external and plugged-in or internal to the motherboard. The most common type of device that you will work with are [disks](./Disks.md). Devices are hardware that require access to the CPU in order to function. Devices can either be external and plugged-in or internal to the motherboard. The most common type of device that you will work with are [disks](./Disks.md).
Devices are files but they have some different capabilities than ordianry files. There are two types: **block** and **stream**. Device files reside in the `/dev/` directory. Devices are files but they have some different capabilities than ordinaryq files. There are two types: **block** and **stream**. Device files reside in the `/dev/` directory.
Some of the most important device files are: Some of the most important device files are:
@ -49,4 +49,6 @@ The [mode](/Programming_Languages/Shell_Scripting/File_permissions_and_execution
`/dev/null` is a virtual device: it doesn't actually exist as a piece of hardware on the system. It can be useful when [bash scripting](/Programming_Languages/Shell/Redirect_to_dev_null.md) as a place to direct output that you don't care about, for example errors or verbose program read-outs. `/dev/null` is a virtual device: it doesn't actually exist as a piece of hardware on the system. It can be useful when [bash scripting](/Programming_Languages/Shell/Redirect_to_dev_null.md) as a place to direct output that you don't care about, for example errors or verbose program read-outs.
I like to think of `/dev/null` as being like earth in a circuit. It's an outlet to safely dispose of things you are not interested in.
> ! Make notes on this. Base on : https://linuxhint.com/what_is_dev_null/ > ! Make notes on this. Base on : https://linuxhint.com/what_is_dev_null/

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_meta/Topic_Log.md
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- Read up properly about `find` and `read` - Read up properly about `find` and `read`
- `.list` file extension - `.list` file extension
- Error handling - Error handling
- Splitting strings
- Awk - Awk
- https://dane-bulat.medium.com/the-awk-programming-language-an-introduction-7035d343cd30 - https://dane-bulat.medium.com/the-awk-programming-language-an-introduction-7035d343cd30
## Linux
- `/dev/null` in greater depth
## SQL ## SQL
- What is a _schema_ in MySQL/ SQL ? - What is a _schema_ in MySQL/ SQL ?