Using single brackets () versus double brackets ([]) is a personal preference and really depends on how you've been taught commands and shell scripting.

使用单层方括号()还是双层方括号([])是个人习惯问题，实际上取决于您如何学习命令和shell脚本编程。

youdao

Using single brackets () versus double brackets ([]) is a personal preference and really depends on how you've been taught commands and shell scripting.

使用单层方括号()还是双层方括号([])是个人习惯问题，实际上取决于您如何学习命令和shell脚本编程。

youdao