捕获shell（）函数的输出

Question

我需要使用R唤起一些shell命令。我还需要捕获该命令的输出（它输出到R控制台中）。不幸的是，capture.output无法正常工作。

> shell("test")
'test' is not recognized as an internal or external command,
operable program or batch file.
Warning message:
In shell("test") : 'test' execution failed with error code 1

我需要捕获这一部分：

'test' is not recognized as an internal or external command,
operable program or batch file.

你们中的任何人都知道如何解决该问题吗？

Answer 1

只需使用intern = TRUE：

out <- shell("test", intern = TRUE)
out
#[1] "'test' is not recognized as an internal or external command,"
#[2] "operable program or batch file."                             
#attr(,"status")
#[1] 1