Tag: linux

• Check if ffmpegthumbnailer is installed

ffmpegthumbnailer -h
sudo apt update
sudo apt install ffmpegthumbnailer

• Then clear the thumbnail cache

rm -rf ~/.cache/thumbnails/*

• Restart files

nautilus -q

• Check service status

systemctl status bluetooth.service


● bluetooth.service - Bluetooth service
     Loaded: loaded (/usr/lib/systemd/system/bluetooth.service; enabled; preset: enabled)
     Active: active (running) since Fri 2025-03-21 07:57:38 IST; 1min 18s ago
       Docs: man:bluetoothd(8)
   Main PID: 21633 (bluetoothd)
     Status: "Running"
      Tasks: 1 (limit: 76673)
     Memory: 1.1M (peak: 1.6M)
        CPU: 55ms
     CGroup: /system.slice/bluetooth.service
             └─21633 /usr/libexec/bluetooth/bluetoothd

• Auto connect script for device when it’s on(add it to cronjob or create service)

#!/bin/bash

if [[ $(hcitool con | grep '00:1B:66:0F:XX:XX' | wc -l) != 1 ]]
then
    echo "connect 00:1B:66:0F:XX:XX" | bluetoothctl

else
    echo "Already connected to 00:1B:66:0F:XX:XX"
fi

• For monitoring events on Bluetooth

root@home:~# bluetoothctl
bluetooth]# [NEW] Device F4:C8:8A:7F:xx:xx CP250003
[bluetooth]# hci0 type 7 discovering off
[bluetooth]# hci0 type 7 discovering on
[bluetooth]# hci0 type 7 discovering off
[bluetooth]# hci0 type 7 discovering on
[bluetooth]# [DEL] Device F4:C8:8A:7F:xx:xx CP250003
[bluetooth]# [NEW] Device F4:C8:8A:7F:xx:xx CP250003
[bluetooth]# hci0 type 7 discovering off
[bluetooth]# hci0 type 7 discovering on
[bluetooth]# [CHG] Device D0:49:7C:8F:xx:xx RSSI: 0xffffffab (-85)



list                                              List available controllers
show [ctrl]                                       Controller information
select <ctrl>                                     Select default controller
devices [Paired/Bonded/Trusted/Connected]         List available devices, with an optional property as the filter
system-alias <name>                               Set controller alias
reset-alias                                       Reset controller alias
power <on/off>                                    Set controller power
pairable <on/off>                                 Set controller pairable mode
discoverable <on/off>                             Set controller discoverable mode
discoverable-timeout [value]                      Set discoverable timeout
agent <on/off/auto/capability>                    Enable/disable agent with given capability
default-agent                                     Set agent as the default one
advertise <on/off/type>                           Enable/disable advertising with given type
set-alias <alias>                                 Set device alias
scan <on/off/bredr/le>                            Scan for devices
info [dev/set]                                    Device/Set information
pair [dev]                                        Pair with device
cancel-pairing [dev]                              Cancel pairing with device
trust [dev]                                       Trust device
untrust [dev]                                     Untrust device
block [dev]                                       Block device
unblock [dev]                                     Unblock device
remove <dev>                                      Remove device
connect <dev>                                     Connect device
disconnect [dev]                                  Disconnect device
menu <name>                                       Select submenu
version                                           Display version
quit                                              Quit program
exit                                              Quit program
help                                              Display help about this program
export                                            Print environment variables

[root@lp-knode-1 ~]# date
Tue Mar  4 19:32:46 IST 2025

[root@lp-knode-1 ~]# timedatectl
               Local time: Tue 2025-03-04 19:33:01 IST
           Universal time: Tue 2025-03-04 14:03:01 UTC
                 RTC time: Tue 2025-03-04 14:27:56
                Time zone: Asia/Kolkata (IST, +0530)
System clock synchronized: no
              NTP service: inactive
          RTC in local TZ: no


[root@lp-knode-1 ~]# timedatectl set-ntp on
[root@lp-knode-1 ~]# timedatectl status
               Local time: Tue 2025-03-04 20:00:13 IST
           Universal time: Tue 2025-03-04 14:30:13 UTC
                 RTC time: Tue 2025-03-04 14:30:13
                Time zone: Asia/Kolkata (IST, +0530)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

[root@lp-knode-1 ~]# date
Tue Mar  4 20:00:17 IST 2025

1. Fedora Media Writer

2. SUSE Studio Imagewriter

3.UNetbootin

4. Ventoy

• all process run in /proc

ls /proc

• We can see what command is used to run the process

cat /proc/<process_id>/cmdline

• process std std error log can be found in

cat /proc/<process_id>/fd/1
cat /proc/<process_id>/fd/2