Shell 如何实现2>&；朱莉娅1号

假设我有命令

`echo hello`

现在，我想将它的STDOUT和STDERR重定向到一个流，这样它就像bash中的

2>&1

。我看到了两个关于Julia的问题，但仍然不明白Julia v.0.4应该如何运作

---

请参阅管道的帮助，特别是：

run(pipeline(`echo hello`, stdout=STDOUT, stderr=STDOUT))

将两者重定向到同一个流（进程

STDOUT

）。这也可能是其他原因

以下是您可以从REPL获得的帮助：

help?> pipeline
search: pipeline

  pipeline(command; stdin, stdout, stderr, append=false)

  Redirect I/O to or from the given command. Keyword arguments specify which
  of the command's streams should be redirected. append controls whether file
  output appends to the file. This is a more general version of the 2-argument
  pipeline function. pipeline(from, to) is equivalent to pipeline(from,
  stdout=to) when from is a command, and to pipeline(to, stdin=from) when from
  is another kind of data source.

  Examples:

  run(pipeline(`dothings`, stdout="out.txt", stderr="errs.txt"))
  run(pipeline(`update`, stdout="log.txt", append=true))

  pipeline(from, to, ...)

  Create a pipeline from a data source to a destination. The source and
  destination can be commands, I/O streams, strings, or results of other
  pipeline calls. At least one argument must be a command. Strings refer to
  filenames. When called with more than two arguments, they are chained
  together from left to right. For example pipeline(a,b,c) is equivalent to
  pipeline(pipeline(a,b),c). This provides a more concise way to specify
  multi-stage pipelines.

  Examples:

  run(pipeline(`ls`, `grep xyz`))
  run(pipeline(`ls`, "out.txt"))
  run(pipeline("out.txt", `grep xyz`))

---

此外，您应该升级到至少0.5。0.4不再受支持，0.6不久将发布。

您是如何从REPL获得帮助的？在REPL提示符下键入

？

。查看。Julia宏用于同时抑制和/或捕获输出（STDOUT）、警告（STDERR）或两个流