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10
Operating_Systems/Devices.md
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@ -6,10 +6,9 @@ tags:
# Devices
Devices are hardware that require access to the CPU in order to function. Devices can either be external and plugded-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 ordinary 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 ordianry files. There are two types: **block** and **stream**. Device files reside in the `/dev/` directory.
Some of the most important device files are:
* `hda` : a harddisk on a port
@ -21,7 +20,7 @@ So when you see `sda` listed for example, this isn't the harddisk itself, it is
## Listing devices
The following `ls` within the `dev` directory shows my main harddrive partitions:
The following `ls` within the `/dev/` directory shows my main harddrive partitions:
```
brw-rw---- 1 root disk 259, 1 Jun 4 11:00 nvme0n1p1
brw-rw---- 1 root disk 259, 2 Jun 4 11:00 nvme0n1p2
@ -45,4 +44,5 @@ The [mode](../Programming_Languages/Shell_Scripting/File_permissions_and_executi
## /dev/null
`/dev/null` is a virtual device: it doesn't actually exist as a piece of hardware on the system.
Base on : https://linuxhint.com/what_is_dev_null/
> ! Make notes on this. Base on : https://linuxhint.com/what_is_dev_null/