Zeal Young QuiteZeal

Installation dependency

sudo apt-get update  
sudo apt-get install git build-essential linux-libc-dev
sudo apt-get install cmake cmake-gui
sudo apt-get install libusb-1.0-0-dev libusb-dev libudev-dev
sudo apt-get install mpi-default-dev openmpi-bin openmpi-common 
sudo apt-get install libflann1.9 libflann-dev
sudo apt-get install libeigen3-dev  You need to download the correct version and install it 
sudo apt-get install libboost-all-dev

	Smileys & People
`:bowtie:`	😄 `:smile:`	😆 `:laughing:`
😊 `:blush:`	😃 `:smiley:`	☺️ `:relaxed:`
😏 `:smirk:`	😍 `:heart_eyes:`	😘 `:kissing_heart:`
😚 `:kissing_closed_eyes:`	😳 `:flushed:`	😌 `:relieved:`
😆 `:satisfied:`	😁 `:grin:`	😉 `:wink:`
😜 `:stuck_out_tongue_winking_eye:`	😝 `:stuck_out_tongue_closed_eyes:`	😀 `:grinning:`
😗 `:kissing:`	😙 `:kissing_smiling_eyes:`	😛 `:stuck_out_tongue:`
😴 `:sleeping:`	😟 `:worried:`	😦 `:frowning:`

Locations of Ubuntu's desktop shortcut

They will be on these three locations:

/usr/share/applications
/usr/local/share/applications
~/.local/share/applications

Normally, for not root user, it will be at the home directory, that mean is~/.local.

Change SSH port on CentOS 8

The key step is to turn your want listen-port and close the default ssh-port. For CentOS 8, will use firewalld

Open your want listen-port and close the default

sudo firewall-cmd --zone=public --permanent --add-port=30000/tcp
sudo firewall-cmd --zone=public --permanent --remove-service=ssh

If firewalld not installed, you can manually install and enable it.

Fixed chsh: command not found in CentOS 8

This problem happens on some vps provider.

Need to manual install to solve it

sudo dnf install util-linux-user

That means use dnf to solve it.

Turn on the Google BBR on CentOS8

there is an easy way if you have kernel version above 4.9.0 type this to display the current version: uname -R

Just three steps to turn on BBR

Line by line to input:

echo 'net.core.default_qdisc=fq' | sudo tee -a /etc/sysctl.conf

Change Hostname in CentOS or Ubuntu

I choose the manual way

type this to display current hostname:

hostname

and type this to change it:

sudo hostnamectl set-hostname NewName

Change Linux Timezone

Use `date -R` to display system time

Sometime the linux will use 0 timezone, so we need to change.

Type this:

$ timedatectl list-timezones

Keep ssh connection alive

Here is the solution to keep the terminal ssh status alive

If you don't know where the file you should change, you can:

$ find / -name "ssh_config" it will tell where is it, such as /etc/ssh/sshd_config

change the default config

$ sudo vim /etc/ssh/sshd_config and find

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