“adb devices” command won't detect any android devices

Step 1. Find vendor ID by using "lsusb"
Step 2. Add vendor Id to ~/.android/adb_usb.ini
Step 3. Restart adb
Step 4. Test. Open a terminal to run "sudo adb logcat". Open another terminal to run "sudo adb devices"

Vim Plugin Howto: NERDTree

1. NERDTree
  a. ":NERDTree" to open NERD Tree in vim
  b. "Up" : to move up cursor
  c. "Down" : to move down cursor
  d. "Enter" : to open a directory
  e. "o": to open a file
  e. "H" :to show or hide hidden files
  f. "R" : Refresh the tree, useful if files change outside of Vim
  h. "m" : show the NERD Tree menu
  i. "?" : NERD Tree quick help
  j. ":q" : exit 



Refer to:
  https://medium.com/usevim/nerd-tree-guide-bb22c803dcd2



2. CScope

1. Run cscope

cscope -R -b

2. 

 Ctrl-]  : split horizontal pane (editing new buffer)

 Ctrl-w s or ":spit" : split horizontal pane (editing current buffer)

 Ctrl-w v or ":vsplit" : split vertical pane (editing current buffer)

Refer to:

  1. https://a0gustinus.wordpress.com/2013/06/01/browsing-source-code-in-linux-vimcscope/
  2. https://dougblack.io/words/a-good-vimrc.html

vim plugin manager : vim-plug

1. Automatic Installation (load plug.vim to ~/.vim/autoload/plug.vim )

Place the following code in your .vimrc before plug#begin() call

if empty(glob('~/.vim/autoload/plug.vim'))
  silent !curl -fLo ~/.vim/autoload/plug.vim --create-dirs
    \ https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim
  autocmd VimEnter * PlugInstall --sync | source $MYVIMRC
endif

Note that --sync flag is used to block the execution until the installer finishes.

2. Migrating from other plugin managers

Download plug.vim in autoload directory

curl -fLo ~/.vim/autoload/plug.vim --create-dirs \
    https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim

and update your .vimrc as needed.

With Vundle.vim	Equivalent vim-plug configuration
filetype off set rtp+=~/.vim/bundle/Vundle.vim call vundle#begin() Plugin 'VundleVim/Vundle.vim' Plugin 'junegunn/seoul256.vim' Plugin 'junegunn/goyo.vim' Plugin 'junegunn/limelight.vim' call vundle#end() filetype plugin indent on syntax enable	call plug#begin('~/.vim/plugged') Plug 'junegunn/seoul256.vim' Plug 'junegunn/goyo.vim' Plug 'junegunn/limelight.vim' call plug#end()

vim-plug does not require any extra statement other than plug#begin() and plug#end(). You can remove filetype off, filetype plugin indent on and syntax on from your .vimrc as they are automatically handled by plug#begin() and plug#end().

Refer to:
  https://github.com/junegunn/vim-plug/wiki/faq

Split windows in Vim

1. Splitting panes

 Ctrl-w n  : split horizontal pane (editing new buffer)

 Ctrl-w s or ":spit" : split horizontal pane (editing current buffer)

 Ctrl-w v or ":vsplit" : split vertical pane (editing current buffer)

2. Closing panes

 Ctrl-w c  or ":q": close pane

 Ctrl-w o  : close all panes, only current pane opened

3. Navigating panes

 Ctrl-w w  : switch to next pane

 Ctrl-w p  : switch to previous pane

 Ctrl-w Up  : switch to up pane

 Ctrl-w Down  : switch to down pane

 Ctrl-w Left  : switch to left pane

 Ctrl-w Right  : switch to right pane

Refer to
  http://codeincomplete.com/posts/split-windows-and-tabs-in-vim/

tmux installation & easy guide

For Ubuntu

tmux installation

sudo apt-get install tmux




Easy Guide

1. Run tmux

tmux

2. All commands in tmux are triggered by a prefix key followed by a command key (quite similar to emacs). By default, tmux uses Ctrl-b as prefix key. Thus Ctrl-b simply means press the Ctrl and b keys at the same time.

3. Splitting panes

 Ctrl-b %  : split horizontal pane

 Ctrl-b "  : split vertical pane

4. Navigating panes

 Ctrl-b Left  : switch to left pane

 Ctrl-b Right  : switch to right pane

 Ctrl-b Up  : switch to up pane

 Ctrl-b Down  : switch to down pane

 Ctrl-b p  : switch to previous pane


 Ctrl-b n  : switch to next pane

5. Adjust pane size

 Ctrl-b Ctrl-Left  : resize horizontal pane

 Ctrl-b Ctrl-Right  : resize horizontal pane

 Ctrl-b Ctrl-Up  : resize vertical pane

 Ctrl-b Ctrl-Down  : resize vertical pane

 Ctrl-b z  : make a pane go full screen or to shrink it back to its previous size

6. Closing panes / window

 Ctrl-b d  or exit : close pane or window

Refer to
  http://www.hamvocke.com/blog/a-quick-and-easy-guide-to-tmux/

Git, remote: error: inflate: data stream error (incorrect data check)

1. Find a local repository that cloned from a corrupted repository
2. To create a new repository in remote side

git init --bare <new repo>

3. The best thing I can think of would be to pull a local copy, change the origin to the new server, and then push:

git pull --all
git remote rm origin
git remote add origin <new repo address>
git push --all --repo=origin

4. Run "git fsck --full" at remote side. Tar and remove bad_repo if everything is ok. Finally, rename new_repo to bad_repo.

git fsck --full
tar -zcvf bad_repo.tar.gz bad_repo
rm -rf bad_repo
mv new_repo bad_repo

Refer to:
  https://stackoverflow.com/questions/11565882/how-to-move-git-repositories-from-github-to-local-server-running-gitolite/37254780

My favorite Git Setting

For Ubuntu

function git_branch {
    ref=$(git symbolic-ref HEAD 2> /dev/null) || return;
    echo "("${ref#refs/heads/}") ";
}

function git_since_last_commit {
    now=`date +%s`;
    last_commit=$(git log --pretty=format:%at -1 2> /dev/null) || return;
    seconds_since_last_commit=$((now-last_commit));
    minutes_since_last_commit=$((seconds_since_last_commit/60));
    hours_since_last_commit=$((minutes_since_last_commit/60));
    minutes_since_last_commit=$((minutes_since_last_commit%60));
    
    echo "${hours_since_last_commit}h${minutes_since_last_commit}m ";
}

PS1="[\[\033[1;32m\]\w\[\033[0m\]] \[\033[0m\]\[\033[1;36m\]\$(git_branch)\[\033[0;33m\]\$(git_since_last_commit)\[\033[0m\]$ " 

Install git-core & bash-completion

sudo apt-get install -y git-core bash-completion

vim ~/.bash_profile & add

# for bash-completion
#[ -f ~/.git-bash-completion.sh ] && . ~/.git-bash-completion.sh

For CentOS


Refer to:
  1: https://ihower.tw/blog/archives/5436  

Can ping internet and local network, but not gateway

Method:
  1. netstate -rn
  2. ifconfig -a
  3. ping local_machine_ip
  4. pint www.google.com
  5. ping gateway ip
  6. nslookup



Refer to:
  https://www.centos.org/forums/viewtopic.php?t=39617

Install Chrome for Ubuntu 16

Goto https://www.google.com.tw/chrome/browser/desktop/index.html and Open it
PS: It only supports 64-bit.

Missing Icons on Ubuntu

  1.  System Settings / Appearance

  2. Select Wallpapers & Theme, Icons and background of terminal will come back

How to Fix VMware Bridged Network have no Internet Access!

Symptom:
  1. Bridged Network have no Internet Access
  2. NAT Network Manual mode have no Internet Access
  3. NAT Network DHCP mode have Internet Access

Steps to solve --------
  1. VMware / Edit / Virtual Network Editor

  2.  VMnet0 disappeared

  3.  Change Settings & Restore Defaults, VMnet0 come out again

 

Refer to:
  https://www.youtube.com/watch?v=BUdLvzIB9Ag

Disable / Remove thinclient_drives

sudo vim /etc/xrdp/sesman.ini

[SessionVariables]
PULSE_SCRIPT=/etc/xrdp/pulse/default.pa
CHANSRV_LOG_PATH=/tmp

VirtualBox Error: creating process for virtual machine (gui/qt)

很可惜無法確認是哪個步驟有效, 只最後將 host 重新開機, 然後, 開 VM Guest OS 就沒有相關的訊息.

------------------------------------
Kernel driver not installed (rc=1908)

How to mount a NTFS drive on CentOS 7

1. Install NTFS related stuffs

sudo yum install ntfs-3g
sudo yum install fuse
sudo modprobe fuse

2. Run GUI => Applications / Utilities / Disks
Select NTFS drive and play it. It will create a mount point automatically.

3. List disks & partitions

sudo lsblk -f

Refer to:
  1. https://www.phpini.com/linux/rhel-centos-fedora-mount-ntfs-partition

Transfer Files/Folders in Linux Using SCP command

scp -Cpr  Source   Destination

ex: scp -Cpr jmt-lab91  tonychung@192.168.0.124:/home/tonychung/Backup88-old/jmt/.VirtualBox/


You can use “-v” parameter to print debug information into the screen. It can help you debugging connection, authentication and configuration problems.

The “-p” parameter will help you on this. An estimated time and the connection speed will appear on the screen.

The “-C” parameter will compress your files on the go. The unique thing is the compression is only happen in the network. When the file is arrived to the destination server, it will returning into the original size as before the compression happen.

Sometimes we need to copy directory and all files / directories inside it. It will be better if we can do it in 1 command. SCP support that scenario using “-r” parameter.

If you choose not to see progress meter and warning / diagnostic messages from SCP, you may disable it using “-q” parameter.

Install Remote Desktop (XRDP)

For Ubuntu 20.04

  Install mate desktop 

  https://linuxconfig.org/how-to-install-mate-desktop-on-ubuntu-20-04-focal-fossa-linux

  Install Mate Xrdp

  Refer to https://www.hiroom2.com/ubuntu-2004-xrdp-mate-en

  

For Ubuntu

Install XFCE4 desktop (bad method, gray screen)

sudo apt-get update
sudo apt-get install xrdp
sudo apt-get install xfce4
echo “xfce4-session” > ~/.xsession
sudo /etc/init.d/xrdp start
sudo /etc/init.d/xrdp status

Install Mate-desktop

sudo apt-get update
sudo apt-get install xrdp
sudo apt-get install mate-core mate-desktop-environment mate-notification-daemon
sudo /etc/init.d/xrdp start
sudo /etc/init.d/xrdp status

Configuring XRDP to use your desktop environment

sudo sed -i.bak '/fi/a #xrdp multiple users configuration \n mate-session \n' /etc/xrdp/startwm.sh

For CentOS

rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-1.el7.nux.noarch.rpm

vim /etc/yum.repos.d/xrdp.repo

[xrdp]
name=xrdp
baseurl=http://li.nux.ro/download/nux/dextop/el7/x86_64/
enabled=1
gpgcheck=0

Install xrdp and tigervnc-server, then start xrdp service

yum -y install xrdp tigervnc-server
systemctl start xrdp.service

Check xrdp service

netstat -antup | grep xrdp

Enable service at system startup

systemctl enable xrdp.service

Edit /usr/lib/firewalld/services/xrdp.xml for XRDP (add port 3389)    PS: xrdp.xml will add a "xrdp" item on firewalld GUI

<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>xrdp</short>
  <description>This option allows you to access Remote Desktop Service.</description>
  <port protocol="udp" port="3389"/>
  <port protocol="tcp" port="3389"/>
</service>

Add xrdpservice for firewalld and reload firewalld

sudo firewall-cmd --permanent --add-service=xrdp
sudo firewall-cmd --reload
sudo systemctl status firewalld

Configure SELinux

sudo chcon --type=bin_t /usr/sbin/xrdp
sudo chcon --type=bin_t /usr/sbin/xrdp-sesman

Refer to:
  1. http://c-nergy.be/blog/?p=8952
  2. https://www.interserver.net/tips/kb/install-xrdp-ubuntu-server-xfce-template/
  3. http://www.itzgeek.com/how-tos/linux/centos-how-tos/install-xrdp-on-centos-7-rhel-7.html

Reinstall VirtualBox on Ubuntu & CentOS

For Ubuntu
To remove virtualbox

sudo dpkg --list virtualbox-*
sudo apt autoremove --purge virtualbox*
dpkg -l virtualbox* | grep ^i

Remove all PPAs from sources.list and source.list.d directory

mkdir ~/apt-tmp
sudo mv /etc/apt/sources.list.d/* ~/apt-tmp

Make sure there is nothing except official repositories sources in /etc/sources.list.

And update your sources:

sudo apt update

Now we can search to see which versions are available to install:

apt-cache madison virtualbox | grep -iv sources

Which produces an output like this:

virtualbox | 5.0.32-dfsg-0ubuntu1.16.04.2 | http://mirrors.kernel.org/ubuntu xenial-updates/multiverse amd64 Packages
virtualbox | 5.0.18-dfsg-2build1 | http://mirrors.kernel.org/ubuntu xenial/multiverse amd64 Packages

Then I would install the last version mentioned in xenial-updates:

sudo apt install virtualbox=5.0.32-dfsg-0ubuntu1.16.04.2

And after all, check that the correct version is installed.

From command line:

dpkg -l virtualbox* | grep ^i

ii  virtualbox                     5.0.32-dfsg-0ubuntu1.16.04.2 amd64        x86 virtualization solution - base binaries
ii  virtualbox-dkms                5.0.32-dfsg-0ubuntu1.16.04.2 all          x86 virtualization solution - kernel module sources for dkms
ii  virtualbox-qt                  5.0.32-dfsg-0ubuntu1.16.04.2 amd64        x86 virtualization solution - Qt based user interface

From GUI: to make sure correct version is running.

Install virtualbox extension pack

sudo /sbin/vboxconfig
sudo apt install virtualbox-ext-pack

For CentOS

1. Display VirtualBox installed

sudo yum update
sudo yum list installed | grep -i VirtualBox

2. Remove VirtualBox-5.1

sudo yum remove VirtualBox-5.1

3. Add Required Yum Repositories

cd /etc/yum.repos.d/
wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo

4. Install Required Packages 

yum install gcc make patch  dkms qt libgomp
yum install kernel-headers kernel-devel fontforge binutils glibc-headers glibc-devel

5. Reboot ans start with newest kernel

reboot

6. Reboot ans start with newest kernel

export KERN_DIR=/usr/src/kernels/`uname -r`

7. Install Oracle VirtualBox and Setup

yum install VirtualBox-5.2

8. List vbox modules (vboxpci, vboxnetadp, vboxnetflt, vboxdrv)

lsmod | grep -i vbox

9. Goto https://www.virtualbox.org/wiki/Downloads and run VirtualBox Extension pack for CentOS

Oracle_VM_VirtualBox_Extension_Pack-5.2.0-118431.vbox-extpack

10. List and add user to vboxusers group

cat /etc/group | grep -i vboxusers
sudo usermod -a -G vboxusers $user_name

11. /var/log/vbox-install.log

Change UUID for VirtualBox

sudo VBoxManage internalcommands sethduuid <file.vdi or file.vmdk>

Refer to:
  1. https://askubuntu.com/questions/900794/virtualbox-rtr3initex-failed-with-rc-1912-rc-1912
  2. https://www.if-not-true-then-false.com/2010/install-virtualbox-with-yum-on-fedora-centos-red-hat-rhel/