sys_dev(5)                    File Formats Manual                   sys_dev(5)

NAME
       /sys/dev/ - system devices

SYNOPSIS
       /sys/dev/

DESCRIPTION
       This directory contains two subdirectories block/ and char/,
       corresponding, respectively, to the block and character devices on the
       system.  Inside each of these subdirectories are symbolic links with
       names of the form major-ID:minor-ID, where the ID values correspond to
       the major and minor ID of a specific device.  Each symbolic link points
       to the sysfs directory for a device.  The symbolic links inside
       /sys/dev/ thus provide an easy way to look up the sysfs interface using
       the device IDs returned by a call to stat(2) (or similar).

       The following shell session shows an example from /sys/dev/:

           $ stat -c "%t %T" /dev/null;
           1 3
           $ readlink /sys/dev/char/1\:3;
           ../../devices/virtual/mem/null
           $ ls -Fd /sys/devices/virtual/mem/null;
           /sys/devices/virtual/mem/null/
           $ ls -d1 /sys/devices/virtual/mem/null/*;
           /sys/devices/virtual/mem/null/dev
           /sys/devices/virtual/mem/null/power/
           /sys/devices/virtual/mem/null/subsystem@
           /sys/devices/virtual/mem/null/uevent

STANDARDS
       Linux.

HISTORY
       Linux 2.6.0.

SEE ALSO
       sysfs(5)

Linux man-pages 6.20              2026-09-09                        sys_dev(5)