在R shell中使用系统调用ssh可以执行后续命令 [英] Calling ssh with system in R shell eats subsequent commands

问题描述

我的工作流程是通过ESS包将emacs缓冲区中的命令从emacs发送到R会话。

My workflow is to send commands from an emacs buffer to an R session in emacs via the ESS package.

a=0;
system("ssh remotehost ls")
a = a+1;

当我快速连续运行上面的三行（即将它们提交到R缓冲区）时， a结束时的值为0.当我慢慢运行它们时，a是1。

When I run the three lines above in rapid succession (i.e. submit them to the R buffer), the value of a at the end is 0. When I run them slowly, a is 1.

我只有通过系统运行ssh命令。在所有其他情况下，命令排队，并且都顺序运行。

I've only had this issue running an ssh command via system. In all other cases, the commands queue up and all run sequentially.

我的同事与他们的R / vim设置完全相同。但是我们在RStudio中没有同样的问题。

My colleagues have the exact same issue with their R/vim setup. But we don't have the same issue in RStudio.

这里的任何建议将会很棒。

Any suggestions here would be great .

推荐答案

ssh 在系统期间放弃任何 stdin ）命令。如果你逐行粘贴，那么在提交 a = a + 1 之前， ssh 终止，因此它被传递给 R 而不是 ssh 。使用 system（ssh ..< / dev / null）或 system（...，input =）如果你不希望终端输入被子进程吃掉。

ssh eats up any stdin during the system() command. If you paste it line by line then ssh terminates before you submit a=a+1 and thus it gets passed to R instead of ssh. Use system("ssh .. < /dev/null") or system(..., input="") if you don't want terminal input to be eaten by the subprocess.

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