bash - "key=value bash-script"用法记录在哪里？

Question

我经常看到 key=value bash-script 将变量传递给 bash 脚本。这是一个例子:

$ echo $0
-bash
$ cat foo.sh
#!/usr/bin/env bash
echo "key1: $key1"
$ key1=value1 ./foo.sh
key1: value1

我检查了Bash Reference Manual .但我无法描述与此用法相关的信息。

Answer 1

第 3.7.4 节“环境”

The environment for any simple command or function may be augmented temporarily by prefixing it with parameter assignments, as described in Shell Parameters. These assignment statements affect only the environment seen by that command.