It always asks for Recovery Key when I boot to Windows, after I set up dual boot (Windows + Ubuntu)

1. To boot into Windows 

Press F12 to enter boot menu. Choose Windows.

 

2. To boot into Ubuntu

(1) Do NOT press F12. Simply wait, and choose 'Ubuntu'. 

Explanation: To boot into Windows, use Windows Boot Manager; to boot into Ubuntu, use GRUB. 

(2) Press F12 to enter boot menu. Choose Ubuntu.

How to extract texts from an image on ubuntu?

To extract English texts - 

$ sudo apt install tesseract-ocr

$ tesseract your_image_name.png extracted_text.txt 

 

To extract Simplified Chinese texts -

$ sudo apt install tesseract-ocr tesseract-ocr-chi-sim

$ tesseract your_image.tiff output_text.txt -l chi_sim

 

To extract Traditional Chinese texts -

$ sudo apt install tesseract-ocr tesseract-ocr-chi-tra

$ tesseract your_image.tiff output_text.txt -l chi_tra

 

To extract multiple languages, e.g. English and Simplified Chinese, and Traditional Chinese texts -

$ tesseract your_image.tiff output_text.txt -l eng+chi_sim+chi_tra

Can not Print Documents from MS OneDrive on MacBooks to Sharp Printers

On the screen of the physical printer, enable 'MS OneDrive'.

On user's MacBook. Open a document from MS OneDrive. File > Print.

'More Settings' > 'Printe using system dialog' > 'Printer Options' > 'Job Handling' > 'Authentication' > 'User Number'. Re-enter your password. (Password for cloud and password for local are different)

'More Settings' > 'Print Using Syetem Dialog' > 'Presets'. Choose 'SharpBP70C45 1'. 'Save Current Settings as Preset...'.

... 'Presets' > 'Edit Preset List...'. Select 'SharpBP70C45' > '-' > 'OK'.

Can not print black and white on MacBook to Sharp BP-70C45 multi-function printer

Normally, in 'Printer Options', there are 6 options, including 'Image Quality'. In 'Image Quality', there are 3 options - 'Automatic', 'Colour', and 'Black and White'.

If there are only 2 options (or fewer than 6 options) in 'Printer Options', and there is not 'Image Quality' option, 

Choose Apple menu > System Settings, then click Printers & Scanners in the sidebar. (You may have to scroll down.)

Click the printer in the Printers list on the right, click the Options & Supplies button, select (or de-select) the Use Generic Printer Features checkbox, then click OK.

How to re-map keys on Ubuntu?

https://github.com/sezanzeb/input-remapper

 

How to turn a USB flash drive into a secure login key for your PC

https://www.pcworld.com/article/2673174/how-to-turn-a-usb-flash-drive-into-a-secure-login-key-for-your-pc.html

 

 

SSH server on Windows

 Press Windows key, search for 'Optional features'. Search for and install 'OpenSSH Server'

OpenSSH Server configuration for Windows Server and Windows

Key-based authentication in OpenSSH for Windows

 

 

A Vim Hater's Guide to Neovim

https://medium.com/@dinithwalpitagama/a-vim-haters-guide-to-neovim-6f235551689e

How To Search And Replace String Across Multiple Files in Vim

https://irian.to/blogs/how-to-search-and-replace-string-across-multiple-files-in-vim

 

Perform substitution with macros and repeat it

While recording a macro, perform substitution on one file, and repeat the macros across all args.

Assuming the same folder structure and args, here is how it is done:

qq                                          // start macro in q register
%s/stringToBeReplaced/replacementString/ge  // the e flag tells vim to not throw an error if there is no match
:wnext                                      //important. This is similar to `:next`, but it also writes the current file
q                                           // stop macro
999@q                                       //repeat this macros either 999 times or to remaining files.

That's it!

Best .rst Online Editor

https://rsted.info.ucl.ac.be/