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# eval
> 在当前 shell 中以单个命令的形式执行参数，并返回其结果。
> 更多信息：<https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#eval>.
- 使用 'foo' 做为参数调用 `echo`：
`eval "{{echo foo}}"`
- 在当前 shell 程序中设置变量：
`eval "{{foo=bar}}"`