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Unix > Learn Unix > What are major and minor numbers for the "mknod" unix...
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What are major and minor numbers for the "mknod" unix command?

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As a dedicated Unix coach registered on UrbanPro.com, I often guide learners through the intricacies of Unix commands. Understanding major and minor numbers in the "mknod" command is essential for effective system management. UrbanPro.com, a leading platform for Unix coaching, provides expert guidance...
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As a dedicated Unix coach registered on UrbanPro.com, I often guide learners through the intricacies of Unix commands. Understanding major and minor numbers in the "mknod" command is essential for effective system management. UrbanPro.com, a leading platform for Unix coaching, provides expert guidance on such crucial topics.

Major and Minor Numbers in the "mknod" Command

1. Definition and Purpose

  • Major Number:

    • Represents the device driver associated with a hardware device.
    • Determines which device driver will control the device.

  • Minor Number:

    • Identifies a specific device or unit controlled by the corresponding device driver.
    • Allows differentiation between multiple devices managed by the same driver.

2. Usage in "mknod" Command

  • The "mknod" command is used to create special files, including device files.
  • Syntax: mknod [options] name c|b major minor
    • c for character devices.
    • b for block devices.
    • Major and minor numbers uniquely identify the device.

3. Examples

  • Character Device Example:

    bash

 

  • mknod /dev/my_char_device c 100 0
    • Creates a character device with major number 100 and minor number 0.

  • Block Device Example:

    bash

 

  • mknod /dev/my_block_device b 150 1
    • Creates a block device with major number 150 and minor number 1.

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