Basic Utils

NFS

• https://dongle94.github.io/ubuntu/ubuntu-nfs-setting/

Boot Repair

• https://help.ubuntu.com/community/Boot-Repair

coredump

• https://blog.meinside.dev/Where-are-my-Core-Dump-Files/

sudo apt-get install systemd-coredump

netcat nc

• https://stackoverflow.com/questions/40286563/send-udp-to-client-behind-a-nat-using-stun
• https://unix.stackexchange.com/questions/592086/netcat-nc-getnameinfo-temporary-failure-in-name-resolution
• https://sarc.io/index.php/miscellaneous/976-nc-netcat-udp-connection-test
• nc Command (Netcat) with Examples
  • https://phoenixnap.com/kb/nc-command#:~:text=The%20Netcat%20(%20nc%20)%20command%20is,%2C%20ncat%20%2C%20and%20others).

iperf

• https://superuser.com/questions/101783/test-the-speed-of-a-local-area-network

$ iperf -s 
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size:  128 KByte (default)
------------------------------------------------------------
[  1] local 192.168.0.2 port 5001 connected with 192.168.0.13 port 55978
[ ID] Interval       Transfer     Bandwidth
[  1] 0.0000-10.0718 sec   272 MBytes   227 Mbits/sec

$ iperf -c 192.168.0.2
------------------------------------------------------------
Client connecting to 192.168.0.2, TCP port 5001
TCP window size:  162 KByte (default)
------------------------------------------------------------
[  3] local 192.168.0.13 port 55978 connected with 192.168.0.2 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec   272 MBytes   228 Mbits/sec

lsof

sudo lsof -i TCP:22
[sudo] password for wom: 
COMMAND    PID USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME
sshd      1184 root    3u  IPv4   34248      0t0  TCP *:ssh (LISTEN)
sshd      1184 root    4u  IPv6   34250      0t0  TCP *:ssh (LISTEN)
ssh     282448  wom    3u  IPv4 2684259      0t0  TCP wom:34832->192.168.0.13:ssh (ESTABLISHED)
ssh     285196  wom    3u  IPv4 2700037      0t0  TCP wom:47238->ec2-54-193-231-0.us-west-1.compute.amazonaws.com:ssh (ESTABLISHED)

gdb

• up/down on backtrace stack
  • https://sonseungha.tistory.com/454
• list

gdb tui

gdb -tui --args /opt/gst/bin/gst-launch-1.0 -v  tcpserversrc host=127.0.0.1 port=5001 ! tcpserversink host=127.0.0.1 port=5002

• http://cloudrain21.com/gdb-tui-text-user-interface

gdbgui

• https://reverseengineering.stackexchange.com/questions/1392/decent-gui-for-gdb

ddd

Install Debug Symbol by apt-get

• https://wiki.ubuntu.com/Debug%20Symbol%20Packages

locale

• https://velog.io/@markyang92/Ubuntu-locale

truncate

• I cannot clear syslog but I can remove it?

truncate -s 0 /var/log/syslog

Thread Analysis using ps

• https://stackoverflow.com/questions/44622008/use-grep-command-the-way-column-names-would-be-preserved

$ ps -eTf |  awk 'NR==1{print} /main.py/{print}'
UID          PID    SPID    PPID  C STIME TTY          TIME CMD
wom        63003   63003   17808  1 12:57 pts/1    00:00:00 python3 ./main.py
wom        63004   63004   63003  0 12:57 pts/1    00:00:00 python3 ./main.py
wom        63107   63107   57979  0 12:58 pts/8    00:00:00 awk NR==1{print} /main.py/{print}

• https://unixhealthcheck.com/blog?id=465

# ps -aux                                                                                                                          
                                                                                                                                                    
USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND                                                                          
root           1  0.0  0.0   3884  3060 pts/2    Ss   02:24   0:00 bash                                                                             
root          50  0.0  0.0   9612  3228 pts/2    S+   02:25   0:00 tmux                                                                             
root          52  0.7  0.1  38908 32288 ?        Rs   02:25   1:41 tmux                                                                             
root          53  0.0  0.0   3884  3096 pts/3    Ss   02:25   0:00 -bash                                                                            
root          63  0.0  0.0   3884  3088 pts/4    Ss+  02:25   0:00 -bash                                                                            
pulse        323  2.8  0.0 460016 27688 ?        S<l  02:29   5:58 pulseaudio -D --verbose --exit-idle-time=-1 --system --disallow-exit             
root         340  0.0  0.0   3884  3084 pts/5    Ss   02:29   0:00 -bash                                                                            
root        2341 85.2  0.1 1284732 41936 pts/5   Sl+  05:58   0:06 ./nesfr_vr_ros2       # <- target_process_to_analyze
root        2380  0.0  0.0   5480  2392 pts/3    R+   05:59   0:00 ps -aux
# ps -T -p 2341
    PID    SPID TTY          TIME CMD
   2341    2341 pts/5    00:00:00 nesfr_vr_main
   2341    2358 pts/5    00:00:02 rs2-gimbal-ctrl
   2341    2359 pts/5    00:00:00 robot-ctrl
   2341    2360 pts/5    00:00:00 robot-ctrl
   2341    2361 pts/5    00:00:00 robot-ctrl
   2341    2362 pts/5    00:00:00 robot-ctrl
   2341    2363 pts/5    00:00:00 robot-ctrl
   2341    2364 pts/5    00:00:00 robot-ctrl
   2341    2365 pts/5    00:00:00 robot-ctrl
   2341    2366 pts/5    00:00:00 robot-ctrl
   2341    2367 pts/5    00:00:00 robot-ctrl
   2341    2368 pts/5    00:00:00 robot-ctrl
   2341    2369 pts/5    00:00:00 robot-ctrl
   2341    2370 pts/5    00:00:02 v4l2src-right:s
   2341    2371 pts/5    00:00:02 v4l2src-left:sr
   2341    2372 pts/5    00:00:02 v4l2src-main:sr
   2341    2373 pts/5    00:00:00 threaded-ml
   2341    2374 pts/5    00:00:00 pulsesrc-audio-
   2341    2375 pts/5    00:00:00 threaded-ml
   2341    2376 pts/5    00:00:00 queue0:src
   2341    2377 pts/5    00:00:00 udpsrc-audio-ou
   2341    2378 pts/5    00:00:00 pulsesrc-audio-
   2341    2379 pts/5    00:00:00 pool-nesfr_vr_r

 ps -eLf | grep gst
wom       185873  185872  185873  0    1  9월18 ?      00:00:11 cscope -dl -f /home/wom/jylee/gstreamer/cscope.out
wom       284977  228559  284977  1    4 16:53 pts/3    00:00:00 /opt/gst/bin/gst-launch-1.0 -v tcpserversrc host=127.0.0.1 port=5001 ! tcpserversink host=127.0.0.1 port=5002
wom       284977  228559  284978  0    4 16:53 pts/3    00:00:00 /opt/gst/bin/gst-launch-1.0 -v tcpserversrc host=127.0.0.1 port=5001 ! tcpserversink host=127.0.0.1 port=5002
wom       284977  228559  284979  0    4 16:53 pts/3    00:00:00 /opt/gst/bin/gst-launch-1.0 -v tcpserversrc host=127.0.0.1 port=5001 ! tcpserversink host=127.0.0.1 port=5002
wom       284977  228559  284980  0    4 16:53 pts/3    00:00:00 /opt/gst/bin/gst-launch-1.0 -v tcpserversrc host=127.0.0.1 port=5001 ! tcpserversink host=127.0.0.1 port=5002

ldconfig & /etc/ld.so.conf

• https://unix.stackexchange.com/questions/425251/using-ldconfig-and-ld-so-conf-versus-ld-library-path
• Tools for dynamic library loading

cpp to print defined macros recursively

• https://stackoverflow.com/questions/503878/how-to-know-what-the-errno-means

cpp -dM /usr/include/errno.h | grep 'define E' | sort -n -k 3

diff

diff --color  -u test0.txt test1.txt 
--- test0.txt	2022-12-21 13:13:54.344511510 +0900
+++ test1.txt	2022-12-21 13:13:47.704507874 +0900
@@ -1,5 +1,5 @@
 abcdefg
 fadsafdf
-adfafadsf
-fdsfaadsf
+fadfadfadfadsfad
 adfadfasd
+

Network Utils

nmcli: network device setup

• https://unix.stackexchange.com/questions/264452/how-to-update-the-gateway-with-nmcli

brctl: bridge setup

• https://wiki.debian.org/BridgeNetworkConnections
• https://wiki.archlinux.org/title/network_bridge
• https://superuser.com/questions/709879/setting-up-a-wifi-hotspot-with-brctl-and-hostapd
• https://serverfault.com/questions/152363/bridging-wlan0-to-eth0
• https://siamdaarc.tistory.com/107#:~:text=%EB%A6%AC%EB%88%85%EC%8A%A4%EC%97%90%EC%84%9C%20%EB%B8%8C%EB%A6%AC%EC%A7%80%EB%A5%BC%20%EC%B6%94%EA%B0%80%ED%95%98%EB%8A%94%20%EB%AA%85%EB%A0%B9%EC%96%B4%EC%9D%B4%EB%8B%A4.

iptables

• https://phoenixnap.com/kb/iptables-delete-rule

Package Utils

Download Packages from Web

Example of libeigen3-dev of bionic

• https://packages.ubuntu.com/bionic/libeigen3-dev
• https://packages.ubuntu.com/bionic/all/libeigen3-dev/download

Use add-apt-repository

• https://itsfoss.com/add-apt-repository-command-not-found/

sudo apt-get install software-properties-common

• How to use
  • https://linuxize.com/post/how-to-add-apt-repository-in-ubuntu/

Install Graphics Drivers

sudo add-apt-repository ppa:graphics-drivers
sudo apt-get update
sudo apt-get install nvidia-driver-xxx

$ ubuntu-drivers list
nvidia-driver-525, (kernel modules provided by linux-modules-nvidia-525-generic)
nvidia-driver-418-server, (kernel modules provided by linux-modules-nvidia-418-server-generic)
nvidia-driver-515-server, (kernel modules provided by linux-modules-nvidia-515-server-generic)
nvidia-driver-470, (kernel modules provided by linux-modules-nvidia-470-generic)
nvidia-driver-510, (kernel modules provided by linux-modules-nvidia-510-generic)
nvidia-driver-450-server, (kernel modules provided by linux-modules-nvidia-450-server-generic)
nvidia-driver-470-server, (kernel modules provided by linux-modules-nvidia-470-server-generic)
nvidia-driver-515, (kernel modules provided by linux-modules-nvidia-515-generic)
nvidia-driver-525-server, (kernel modules provided by nvidia-dkms-525-server)
nvidia-driver-390, (kernel modules provided by linux-modules-nvidia-390-generic)

Intel integrated HD graphics for Display, NVIDIA-GPU for CUDA

## check display card and driver status
sudo lshw -c display
# or sudo lshw -c video

## check loaded display card and driver
lsmod | grep nvidia
# or nvidia-smi
# or lsmod | grep nouveau

## remove old Nvidia driver
sudo apt purge nvidia-*
# or sudo apt remove nvidia-*

## add driver repository
sudo add-apt-repository ppa:graphics-drivers/ppa

## identify suitable driver version
sudo ubuntu-drivers devices
## if ubuntu-drivers command not found
sudo apt install ubuntu-drivers-common

## install drivers from ppa database
sudo apt install nvidia-driver-430
# sudo apt install nvidia-XYXYX nvidia-settings
# v430 was the recommended and the latest by writing this gist

## this installs drivers from Nvidia
wget http://us.download.nvidia.com/tesla/418.67/NVIDIA-Linux-x86_64-418.67.run
# or wget http://us.download.nvidia.com/XFree86/Linux-x86_64/418.74/NVIDIA-Linux-x86_64-418.74.run
# supporting packages may need to be installed before running following
sudo bash ./NVIDIA-Linux-x86_64-418.67.run --dkms

## reboot
sudo reboot

## check driver details and settings
nvidia-smi or nvidia-settings

## select driver
prime-select query
## usage: sudo prime-select nvidia or sudo prime-select intel

## set nvidia
sudo prime-select nvidia 

## Reboot and Goto BIOS
## Set BIOS Display Setup as Integrated Graphics, not External GPU or External PCI
## connect HDMI cable to intel GPU Head
## Reboot

## display usage
dpkg -L nvidia-driver-430

• PPA Graphics-Drivers Team Page: https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa

Downgrade pkg version

apt-cache showpkg <package_name>
apt-cache show <package_name>

apt-cache madison <package_name>

apt-cache madison vim
       vim | 2:8.1.2269-1ubuntu5.4 | http://ftp.daum.net/ubuntu focal-updates/main amd64 Packages
       vim | 2:8.1.2269-1ubuntu5.4 | http://ftp.daum.net/ubuntu focal-security/main amd64 Packages
       vim | 2:8.1.2269-1ubuntu5 | http://ftp.daum.net/ubuntu focal/main amd64 Packages

apt list -a vim
Listing... Done
vim/focal-updates,focal-security,now 2:8.1.2269-1ubuntu5.4 amd64 [installed]
vim/focal 2:8.1.2269-1ubuntu5 amd64

vim/focal-updates,focal-security 2:8.1.2269-1ubuntu5.4 i386
vim/focal 2:8.1.2269-1ubuntu5 i386

Remove PPA Repository

sudo apt-add-repository --remove ppa:inivation-ppa/inivation-bionic
 Neuromorphic vision company.
Packages for Ubuntu Bionic 18.04 LTS.
 More info: https://launchpad.net/~inivation-ppa/+archive/ubuntu/inivation-bionic
Press [ENTER] to continue or Ctrl-c to cancel removing it.

Window Mode

• How to switch boot target to text or GUI in systemd Linux
  • https://www.cyberciti.biz/faq/switch-boot-target-to-text-gui-in-systemd-linux/

systemctl get-default
sudo systemctl set-default multi-user.target
sudo systemctl reboot

systemctl get-default
sudo systemctl set-default graphical.target
sudo reboot

jounalctl -b -1 for Shutdown Process

• https://forums.linuxmint.com/viewtopic.php?t=232668

 Change the line in /etc/systemd/journald.conf from the compiled-in default...
#Storage=auto

Power Key Setup

Shut down immediately by Power Key

Graphical Mode

• On gdm 60secs delay set as default
• To off the delay setting, follow the line below
  • https://www.reddit.com/r/pop_os/comments/nwphr2/disable_60_seconds_delay_for_shutdown_restart/
  • https://ubuntuforums.org/archive/index.php/t-1903620.html

$ gsettings list-recursively | grep logout-prompt
org.gnome.SessionManager logout-prompt true
$ gsettings set org.gnome.SessionManager logout-prompt false
$ gsettings get  org.gnome.SessionManager logout-prompt
true

• https://manpages.ubuntu.com/manpages/bionic/man1/dconf.1.html

$ dconf write /org/gnome/gnome-session/logout-prompt false
$ dconf read /org/gnome/gnome-session/logout-prompt 
true

• use dconf-editor for editing SessionManager
  • https://askubuntu.com/questions/15262/graphical-editor-for-gsettings-dconf

Text Mode

• Nothing to do

Ignore Power Key

• https://ramenshin.tistory.com/444

sudo vim /etc/systemd/logind.conf
...
HandlePowerKey=ignore
...

sudo systemctl restart systemd-logind

Dell Aurora Kernel Panics

• https://www.dell.com/community/Linux-General/Kernel-Panic-comfirmed/td-p/4687595

Google Remote Setup for Ubuntu

• https://blog.naver.com/PostView.nhn?blogId=tinz6461&logNo=222296002269&parentCategoryNo=&categoryNo=54&viewDate=&isShowPopularPosts=true&from=search

Hangul Korean Setup with ibus on Ubuntu

• https://greedywyatt.tistory.com/105