为什么在bash 3.2中source命令不能与进程替换一起使用? [英] Why source command doesn't work with process substitution in bash 3.2?

问题描述

我有以下shell脚本:

I've the following shell script:

cat <(echo foo)
source <(echo bar=bar)
echo $bar

但是，它在GNU bash 3.2和4.3中的工作方式有所不同，如下所示:

However it works differently in GNU bash 3.2 and 4.3 as shown below:

$ /bin/bash foo.sh 
foo

3.2.53(1)-release

$ /usr/local/bin/bash foo.sh 
foo
bar
4.3.33(1)-release

为什么这仅适用于一个版本?是错误还是新增功能?

Why this works only on one version? Is it a bug or added feature?

似乎进程替换可以正常工作，但是在采购文件时出现了问题.

It seems the process substitution works fine, however problem lay when sourcing the file.

如果这是预期的行为，我应该使用什么其他语法代替source来自标准输入的内容，以便在不同的bash版本之间兼容?

If this is expected behaviour, what other syntax should I use instead to source something from the standard input to be compatible between different bash versions?

推荐答案

这是

...或者类似地:

source /dev/stdin <<<"$(cat <(...))"

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