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10
Operating_Systems/Devices.md
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@ -6,10 +6,9 @@ tags:
# Devices # 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 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).
[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: Some of the most important device files are:
* `hda` : a harddisk on a port * `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 ## 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, 1 Jun 4 11:00 nvme0n1p1
brw-rw---- 1 root disk 259, 2 Jun 4 11:00 nvme0n1p2 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
`/dev/null` is a virtual device: it doesn't actually exist as a piece of hardware on the system. `/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/