命名管道不会等到bash完成 [英] Named pipe does not wait until completion in bash

问题描述

在下面的test.jl中创建一个output.txt并生成一些控制台输出.控制台输出处理得很好.但是控制在回声之后立即返回，甚至在完全创建output.txt之前.在echo和mv之间放置等待会导致不确定的等待.回车应该在不杀死管道的情况下传递到管道吗?

In the following test.jl creates an output.txt and generates some console output. console output is very well handled. but control returns immediately after echo even before output.txt is created completely. placing a wait in between echo and mv causes an indefinite wait. Should a carriage return be passed to the pipe without killing the pipe yet?

mkfifo pipe
sleep 1000000 > pipe &
julia <pipe >stdout.txt 2>stderr.txt &

echo "include(\"test.jl\")" > pipe
mv output.txt temp/
echo "include(\"test2.jl\")" > pipe

谢谢！

推荐答案

我知道test.jl和test2.jl都写入output.txt，因此在运行test2.jl或test2.jl期望output.txt在temp/目录中，并且必须在text2.jl运行之前将其移至该位置.

I understand that test.jl and test2.jl both write to output.txt so you have to move the file to another directory before running test2.jl or test2.jl expects output.txt in temp/ directory and you have to move it there before text2.jl runs.

如果是，那么以下代码应该可以解决问题:

If yes then the following code should solve the problem:

mkfifo pipe
sleep 1000000 > pipe &
julia <pipe >stdout.txt 2>stderr.txt &

echo "include(\"test.jl\")" > pipe
echo "mv(\"output.txt\", \"temp/\")" > pipe
echo "include(\"test2.jl\")" > pipe

这样Julia会运行mv命令，并确保在test.jl之后但在test2.jl之前执行该命令.

In this way Julia runs mv command and you make sure that it is executed after test.jl but before test2.jl.

但是实际上我们正要写一个名为例如script.jl:

But actually we are getting to a point where it would be better to write a Julia script named e.g. script.jl:

include("test.jl")
mv("output.txt", "temp/")
include("test2.jl")

并使用julia script.jl运行它.

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