01 November 2025
cssUniversal.html
29 October 2025
28 October 2025
Beautiful Letter with Shadow
body {
margin: 0;
background-color: rgba(0, 0, 0, 0.09);
color: rgba(0, 0, 0, 0.6);
font-family: sans-serif;
}
div.container {
display: flex;
justify-content: center;
min-height: 100vh;
padding: 1rem;
}
div.card {
background-color: rgba(255, 255, 255, 1);
max-width: 585px;
width: 100%;
box-shadow:
0 4px 8px 0 rgba(0, 0, 0, 0.2),
0 6px 20px 0 rgba(0, 0, 0, 0.19);
padding: 1rem;
border-radius: 4px;
}
h1,
h2,
h3 {
margin: 1.5rem 0 0 0;
}
div.card {
padding-bottom: 3rem;
}
.contact {
text-align: center;
}
@media print {
body {
background: white !important;
}
.container {
display: block;
min-height: auto;
padding: 0;
margin: 0;
}
.card {
box-shadow: none !important;
border: none;
background: white !important;
max-width: 100%;
padding: 1in;
}
body, p, li, h1, h2, h3 {
color: black; !important;
font-family: "Arial", sans-serif;
}
nav, footer, .no-print {
display: none !important;
}
a {
color: black;
text-decoration: none;
}
}
</style>
<body>
<div class="container">
<div class="card">
<div class="contact">...</div>
...
</div>
</div>
</body>
21 October 2025
'Job systemd-networkd-wait-online.service/start running' takes a long time
$ ip add
Find the name of your network interface, e.g. wlp3s0
Open the file -
$ sudo systemctl disable systemd-networkd-wait-online.service
or
$ sudo vi /usr/lib/systemd/system/systemd-networkd-wait-online.service
Edit the line -
ExecStart=/usr/lib/systemd/systemd-networkd-wait-online
into -
ExecStart=/usr/lib/systemd/systemd-networkd-wait-online --interface=wlp3s0
Then run the command below -
$ sudo systemctl daemon-reload
Reboot your computer.
11 September 2025
08 September 2025
How to Transform or Say Convert Different Format of Files Such as .md, .rst, .html, .docx, .pdf, etc.?
Install 'pandoc' software
How to install pandoc?
$ sudo apt update
$ sudo apt install pandoc
How to use pandoc?
$ tldr pandoc
How to Install and Use Prettier on Ubuntu?
# npm install -g prettier How to make html and css and javaScript files
prettier? $ prettier --write --tab-width 4 test.html 01 September 2025
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
28 August 2025
Can not Print Documents from MS OneDrive on MacBooks to Sharp Printers
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 System Dialog' > 'Presets'. Choose 'SharpBP70C45 1'. 'Save Current Settings as Preset...'.
... 'Presets' > 'Edit Preset List...'. Select 'SharpBP70C45' > '-' > 'OK'.
27 August 2025
Can not print black and white on MacBook to Sharp BP-70C45 multi-function printer
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.
23 August 2025
19 April 2025
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
18 April 2025
05 March 2025
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!