Useful Notes for Mac, Ubuntu and Windows

Outline

• Copy the folder structure without files
• Keyboard
• Ubuntu and windows time
• Create links
• Install matlab .iso file
• Terminator terminal manager
• add a directory to the $PATH
• Configure Multiple monitors (xrandr)
• 9. Color good for Eyes: (R: 199, G: 237, B: 204)
• Using DPT-RP1 in Ubuntu
• GNOME Shell Extensions
• Environment
• conda base in terminal prompt

conda base in terminal prompt

Set auto_activate_base True or False to control this.

# check 
conda config --show | grep auto_activate_base
# set it false
conda config --set auto_activate_base False
source ~/.bashrc
# set it True
conda config --set auto_activate_base True
source ~/.sourcerc

Environment

List all environment variables

$ printenv

Copy the folder structure without files (inside the original folder):

$ find -type d -links 2 -exec mkdir -p “~/save/to/path/examplefolders/{}” \;

Keyboard:

• Show the full path in the folder browse: Ctrl + L; return: esc
• Show/Unshow the hidden files in the folder browse: Ctrl + H
• Set a window occupying the left/right half of the screen :Super + ←/→ (Ubuntu 18.04)

Ubuntu and windows time:

Operating systems store and retrieve the time in the hardware clock located on your motherboard.

Linux/Unix/Mac store the time on the hardware clock as UTC by default. UTC time is Coordinated Universal Time
Windows stores the time on the hardware clock as the local time.

Solutions:

Change the time in linux is more reliable and easier. 
1. make linux use local time
In Ubuntu 18.04: 
$ timedatectl set-local-rtc 1 --adjust-system-clock
To check out if your system uses Local time, just run:
$ timedatectl
Will see the local time zone is in use in the Warning section
2. make windows use UTC time
check here: http://ubuntuhandbook.org/index.php/2016/05/time-differences-ubuntu-1604-windows-10/

Create links

windows:
mklink /j C:\Users\yll\Zotero\storage D:\dropbox\ZoteroStorage (latter is the target)
mklink /j "C:\Users\yll\Zotero\storage" "D:\Google Drive\ZoteroStorage 
Mac:
ln -s /Users/linglingyang/Dropbox/ZoteroStorage /Users/linglingyang/Zotero/storage 
(use absolute path, first is the target)
Ubuntu:
ln -s "/Users/linglingyang/Google Drive/ZoteroStorage" /Users/linglingyang/Zotero/storage
(use absolute path, first is the target)

Install matlab .iso file

# Create a folder to use as a mount point.
$ sudo mkdir /media/mathworks
# Mount the ISO to that folder under root permission
$ sudo mount -t iso9660 -o loop ~/Downloads/R2018b_glnxa64_dvd1.iso /media/mathworks
# Run the installer script use sudo
$ sudo /media/mathworks/install
# installing..........
# Note: check 'Create symbolic links to MATLAB scripts in: '
# mount the second .iso
$ sudo umount /media/mathworks
$ sudo mount -t iso9660 -o loop ~/Downloads/R2018b_glnxa64_dvd2.iso /media/mathworks/  

Terminator terminal manager

$ sudo apt-get install terminator

add a directory to the $PATH

Edit .bashrc in your home directory and add the following line:

$ export PATH="/path/to/dir:$PATH"
// examine the value environment variables
echo $PATH

.bashrc need to be sourced or logout/login (or restart the terminal) for the changes to take effect. To source your .bashrc, simply type

$ source ~/.bashrc

Configure Multiple monitors (xrandr)

$ xrandr --listmonitors
// set DP-5 as the primary display
$ xrandr --output DP-5 --primary 
// set DP-3 to be right of HDMI-0
$ xrandr --output DP-3 --right-of HDMI-0
// turn off the monitor 
$ xrandr --output DP-3 --off
// turn back the monitor
$ xrandr --output DP-5 --auto

Color good for Eyes:

(R: 199, G: 237, B: 204) (#C7EDCC)

Using DPT-RP1 in Ubuntu

package: https://github.com/janten/dpt-rp1-py

Installation

$ pip3 install dpt-rp1-py

Basic Usage

// register the dpt-rp1 device (only need run once)
$ dptrp1 register

// list all documents on the device
$ dptrp1 list-documents
// help
$ dptrp1 -h
// get help for the upload command
$ dptrp1 help upload
// uploading a document to the reader
$ dptrp1 upload ~/Desktop/scan.pdf

GNOME Shell Extensions

tool Tweaks

add extension using browse or command