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Mknod

Create a block device or character device file. The scope of this command: RedHat, RHEL, Ubuntu, CentOS, SUSE, openSUSE, Fedora.

1. Grammar

Mknod [option] device name device type primary device number secondary device number

2. List of option parameters

Option

Description

-- version

Display command version information

-- help

Display help information

-m |-- mode=MODE

Set permissions

-Z |-- context=CTX

Set the security context of SELinux

Device Typ

B, block device; c, character device; u, unbuffered character device; pGrady FIFO device

Device number

It can only be decimal and octal, and if it starts with 0x, it's still decimal. For b, c, u devices, the device number must be given, and for p devices, the device number must be ignored

When the type is b, c, or u, you must specify both the primary and secondary numbers; when the type is p, you must omit them. If the primary or secondary device number begins with 0x or 0x, it is interpreted as hexadecimal; otherwise, if it starts with 0 as octal, the rest is decimal.

3. Examples

1) create a block device file

[root@localhost ~] # mknod / dev/sdb4 b 1 1 / / create a device

[root@localhost weijie] # ls-l / dev/sdb4

Brw-r--r-- 1 root root 1, September 7 08:21 / dev/sdb4

2) create a character device file

[root@localhost ~] # mknod / dev/ttywj c 2 1 / / create a device

[root@localhost weijie] # ls-l / dev/ttywj

Crw-r--r-- 1 root root 2, September 7 09:42 / dev/ttywj

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