Simple Linux Tips
=========================



Could not display an executable file
--------------------------------------

- Right click -> Properties -> Permissions -> Allow executing file as program

File Permissions
-------------------------

- Example: :code:`sudo chmod -R 777 .`
- 755 – commonly used in web server. The owner has all the permissions to read, write and execute. Everyone else can only read and execute, but cannot make changes to the file.
- 777 – Everyone can read write and execute. 
- 644 – Only the owner can read and write. Everyone else can only read. No one can execute the file.
- 655 – Only the owner can read and write, but not execute the file. Everyone else can read and execute, but cannot modify the file.

Set $PATH Variable
---------------------

- Add this line to :code:`~/.profile` file: :code:`export PATH=$PATH:/myNewDir`
- Then run command: :code:`source ~/.profile`

Internet Speed
-----------------

- :code:`sudo nano /etc/gai.conf`
- remove :code:`#` from :code:`#precedence ::ffff:0:0/96  100` and reboot

Install deb File
------------------

- :code:`sudo apt install ./filename.deb`

Install Steam
------------------

.. code-block:: console

  sudo apt-get update
  sudo apt-get install curl python-apt zenity
  
Install Arduino with ESP32
-------------------------------

.. code-block:: console
  
  arduino-linux-setup.sh    # Must do this first
  install.sh
  
  # For ESP32 to work
  pip install pyserial
  
`more info <https://github.com/tesla-cat/FPGA-ESP32-Tesla-Coil#using-esp32-with-arduino-ide>`_

Install Quartus 
--------------------------

.. code-block:: console

  chmod +x QuartusLiteSetup-19.1.0.670-linux.run
  ./QuartusLiteSetup-19.1.0.670-linux.run

- Error: :code:`quartus: error while loading shared libraries: libpng12.so.0: cannot open shared object file: No such file or directory`
- Solution:

.. code-block:: console
  
  sudo wget -q -O /tmp/libpng12.deb http://mirrors.kernel.org/ubuntu/pool/main/libp/libpng/libpng12-0_1.2.54-1ubuntu1_amd64.deb
  sudo dpkg -i /tmp/libpng12.deb 
  sudo rm /tmp/libpng12.deb
  
- Install Download Cable (formerly USB-Blaster) Driver
- :code:`sudo nano /etc/udev/rules.d/51-usbblaster.rules`
- Add the following to the file. Restart Quartus.

.. code-block:: console 

  # Intel FPGA Download Cable
  SUBSYSTEM=="usb", ATTR{idVendor}=="09fb", ATTR{idProduct}=="6001", MODE="0666"
  SUBSYSTEM=="usb", ATTR{idVendor}=="09fb", ATTR{idProduct}=="6002", MODE="0666" 
  SUBSYSTEM=="usb", ATTR{idVendor}=="09fb", ATTR{idProduct}=="6003", MODE="0666"   
  # Intel FPGA Download Cable II
  SUBSYSTEM=="usb", ATTR{idVendor}=="09fb", ATTR{idProduct}=="6010", MODE="0666"
  SUBSYSTEM=="usb", ATTR{idVendor}=="09fb", ATTR{idProduct}=="6810", MODE="0666"

ModelSim Error
----------------------

- Error: :code:`error while loading shared libraries: libXft.so.2: cannot open shared object file: No such file or directory Error.`
- Solution: :code:`sudo apt-get install libxft2 libxft2:i386 lib32ncurses5`

Install Intel FPGA SoC EDS (Embedded Development Suite)
---------------------------------------------------------------

.. code-block:: console

  sudo chmod +x ./SoCEDSSetup-18.1.0.625-linux.run
  sudo ./SoCEDSSetup-18.1.0.625-linux.run

Install Jekyll
-----------------------

- Error: :code:`Failed to build gem native extension`
- Solution: :code:`sudo apt-get install ruby-dev`

Install Android Studio
--------------------------------

.. code-block:: console

  sudo apt update
  sudo apt install openjdk-8-jdk
  sudo snap install android-studio --classic
  sudo apt install libcanberra-gtk-module libcanberra-gtk3-module
  sudo android-studio

Right Click On Touch Pad
--------------------------------

- Just Tap/Click the touch pad anywhere with two fingers!

Angstrom: Install Package 
------------------------------------------------

.. code-block:: console

  opkg update
  opkg install [packagename]
  opkg remove [packagename] --force-removal-of-dependent-packages

React Native Errors
--------------------------
.. code-block:: console
  
  echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
  npm start --reset-cache
  
Windows Powershell Tips
==============================
React Native Errors
-----------------------
- Error: :code:`.ps1 is not digitally signed`
- Solution: :code:`Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass`

Personal
===============
CQT printer
-------------------
https://support.quantumlah.org/index.php/C558_Installation_Guide