It is possible to extract the Linux serial number without using sudo?
I know it is possible to do in Windows: wmic bios get serialnumber and in
macOS: system_profiler | grep "r (system)". Both of them do not require root privileges.
In Linux this can be used: sudo dmidecode -s system-serial-number, but it needs sudo. Is there another way?
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Answer
dmidecode reads this information from physical memory, using /dev/mem, which requires root.
The same information is also provided by the Linux kernel via sysfs in a virtual directory, /sys/devices/virtual/dmi/id.
Unfortunately, someone decided that all information in that virtual directory is open to anyone for reading, just not the serial numbers:
$ ls -l /sys/devices/virtual/dmi/id-r--r--r-- 1 root root 4096 Nov 25 17:12 bios_date-r--r--r-- 1 root root 4096 Nov 14 14:59 bios_vendor-r--r--r-- 1 root root 4096 Nov 25 17:12 bios_version-r--r--r-- 1 root root 4096 Nov 25 17:12 board_asset_tag-r--r--r-- 1 root root 4096 Nov 25 17:12 board_name-r-------- 1 root root 4096 Nov 25 17:12 board_serial-r--r--r-- 1 root root 4096 Nov 14 14:59 board_vendor-r--r--r-- 1 root root 4096 Nov 25 17:12 board_version-r--r--r-- 1 root root 4096 Nov 25 17:12 chassis_asset_tag-r-------- 1 root root 4096 Nov 25 17:12 chassis_serial-r--r--r-- 1 root root 4096 Nov 25 17:12 chassis_type-r--r--r-- 1 root root 4096 Nov 25 17:12 chassis_vendor-r--r--r-- 1 root root 4096 Nov 25 17:12 chassis_version-r--r--r-- 1 root root 4096 Nov 25 17:12 modaliasdrwxr-xr-x 2 root root 0 Nov 25 17:12 power-r--r--r-- 1 root root 4096 Nov 14 14:59 product_name-r-------- 1 root root 4096 Nov 25 17:12 product_serial-r-------- 1 root root 4096 Nov 14 14:59 product_uuid-r--r--r-- 1 root root 4096 Nov 14 14:59 product_versionlrwxrwxrwx 1 root root 0 Nov 14 14:59 subsystem -> ../../../../class/dmi-r--r--r-- 1 root root 4096 Nov 14 14:59 sys_vendor-rw-r--r-- 1 root root 4096 Nov 14 14:59 ueventIf you can install package hal (not installed by default on recent Ubuntu versions), this command will work for you as non-root:
lshal | grep system.hardware.serial system.hardware.serial = '<serial_number>' (string)This works because package hal installs the hald daemon, which runs as root and collects this data, making it possible for lshal to read it as non-root.