Bash：在 output 中重用 printf 變量

Question

是否可以在格式化中多次使用傳遞給printf的變量？

例如，使用這一行：

printf 'Hi %s, welcome to %s. %s is a great place to work. Thanks %s.' "John" "The Icecream Factory"

如何“重用” printf中的第一個和第二個變量？

我在想類似的事情：

printf 'Hi %s[1], welcome to %s[2]. %s[1] is a great place to work. Thanks %s[2].' "John" "The Icecream Factory"

...但顯然不是這樣。

所需 output

Hi John, welcome to The Icecream Factory. The Icecream Factory is a great place to work. Thanks John.

實際 output

Hi John, welcome to The Icecream Factory.  is a great place to work. Thanks .

工作環境為bash 20 中的 bash。

Answer 1

While I don't think it's possible using either the built-in bash implementation of printf or the freestanding GNU printf(1) program, if you can target zsh instead, its version of printf supports POSIX-style printf(3) argument indexing:

通常，轉換規范按順序應用於每個參數，但它們可以通過將%替換為%n$和*替換為*n$來明確指定要使用的第n個參數。 建議您不要將這種顯式樣式的引用與普通樣式混合，並且此類混合 styles 的處理可能會在未來發生變化。

$ printf 'Hi %1$s, welcome to %2$s. %2$s is a great place to work. Thanks %1$s.\n' "John" "The Icecream Factory"
Hi John, welcome to The Icecream Factory. The Icecream Factory is a great place to work. Thanks John.