You will notice that on a US keyboard, shift-4 is "$", which is the bash variable expansion character.

注意到了吗：在美国键盘上，shift-4是 "$"，它是bash变量扩展字符。

youdao

You will notice that on a US keyboard, shift-4 is "$", which is the bash variable expansion character.

注意到了吗：在美国键盘上，shift-4是 "$"，它是bash变量扩展字符。

youdao