Chunyu Ge 葛淳宇 /kɤ꜕꜖꜓ tʂʰuən꜔꜒ y꜕꜖꜓/

Variables and string in the shell

I have not really grasped the tricky variable use and string operations in the shell, and this post is a cheatsheet of the common variable and string operations in the shell. Variables Assigning values to variables, note that = immediately follows the variable name and it allows no space. variable='value' variable="value" variable=value There are several ways of calling a variable, by $variable, ${variable} and "$variable". The curly braces are useful when you need to clearly mark the boundary of the variable name. For example, $variableisvalue will not output the value of $variable since the shell interprets the name of the variable as variableisvalue. To tell the shell where the variable name ends, surround the variable name with curly braces ${variable}isvalue, which is not ambiguous to the shell.

說丁年

《文選》李陵《答蘇武書》：“丁年奉使。”李善注：“丁年，謂丁壯之年也。漢書曰：武留匈奴凡十九歲。始以強壯出，及還，鬢髮並白。”黃生《字詁義府合按》卷下“丁壯”：“漢書·高帝紀：‘丁壯若軍旅’，古丁、當同音，丁壯言其年正當壯時也。後語省，遂單呼爲丁，故民年二十成丁。李陵《答蘇武書》：‘丁年奉使’，正謂年在二十左右也。”李善讀丁年爲丁壯之年，而黃生說古代丁、當同音，並且指實丁年是二十成丁之年，也就是說蘇武奉使是在二十歲。說丁、當同音不確，下面再詳細討論；而說蘇武二十歲奉使，則是錯的。

My neovim setup (with Ghostty)

Last year, I switched from Sublime Text to Neovim and Neovim has proved to be very efficient. This post showcases my Neovim setup and some useful tips. I agree with Guilherme D. Garcia that multiple tools for multiple purposes (RStudio for R, Sublime Text for markdown and $LaTeX$, etc.) is far from perfect, and Neovim indeed provided an integrated way of dealing with all these purposes (markdown/$LaTeX$, R, Python, and many more). It also provides the incredible capabilities of the Vim arsenal.