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If I understand correctly, in Linux, everything is a path, right down to each piece of hardware. I am trying to get information about how my sensors are structured, so I thought I would just use tree to map out all the things in my hwmon directory. However, tree does not behave the same with this directory as I am accustomed to.

When I run tree on a normal directory, I get the subdirectory structure without using the -R or -L flags:

$ tree /home

/home

└── boss

    ├── clones

    ├── Desktop

    ├── Documents

    │   ├── modules.txt

    │   ├── old_docs

    │   │   └── assorted

    │   └── prepscript.txt

    ├── Downloads

    ├── Music

    ├── Pictures

    ├── Public

    ├── Templates

    └── Videos



12 directories, 2 files

but I try to do the same with HWmon, it only goes one level deep, even if I do use the -R flag and even though there is stuff deeper:

$ tree /sys/class/hwmon/

/sys/class/hwmon/

├── hwmon0 -> ../../devices/pci0000:40/0000:40:01.3/0000:43:00.0/hwmon/hwmon0

├── hwmon1 -> ../../devices/pci0000:00/0000:00:01.3/0000:09:00.0/hwmon/hwmon1

├── hwmon2 -> ../../devices/pci0000:40/0000:40:03.1/0000:44:00.0/hwmon/hwmon2

├── hwmon3 -> ../../devices/pci0000:00/0000:00:18.3/hwmon/hwmon3

├── hwmon4 -> ../../devices/pci0000:00/0000:00:19.3/hwmon/hwmon4

├── hwmon5 -> ../../devices/virtual/thermal/thermal_zone0/hwmon5

└── hwmon6 -> ../../devices/platform/nct6775.656/hwmon/hwmon6



7 directories, 0 files

$ tree /sys/class/hwmon/hwmon0

/sys/class/hwmon/hwmon0

├── device -> ../../../0000:43:00.0

├── fan1_input

├── name

├── power

│   ├── async

│   ├── autosuspend_delay_ms

│   ├── control

│   ├── runtime_active_kids

│   ├── runtime_active_time

│   ├── runtime_enabled

│   ├── runtime_status

│   ├── runtime_suspended_time

│   └── runtime_usage

├── pwm1

├── pwm1_enable

├── pwm1_max

├── pwm1_min

├── subsystem -> ../../../../../../class/hwmon

├── temp1_auto_point1_pwm

├── temp1_auto_point1_temp

├── temp1_auto_point1_temp_hyst

├── temp1_crit

├── temp1_crit_hyst

├── temp1_emergency

├── temp1_emergency_hyst

├── temp1_input

├── temp1_max

├── temp1_max_hyst

├── uevent

└── update_interval



3 directories, 27 files

What causes this difference in behavior, and can I just get a simple tree of all the devices?

tree behaves that way because it doesn’t dereference symlinks by default. The -l option will change that:

tree -l /sys/class/hwmon/

but you’ll have fun making sense of all the output.