windows 如何使用管道将一个命令的输出重定向到另一个命令的输入？
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How do I use a pipe to redirect the output of one command to the input of another?
提问by Austin Burk
I have a program which sends text to an LED sign.
我有一个程序可以将文本发送到 LED 标志。
prismcom.exe
棱镜com.exe
To use the program to send "Hello":
使用程序发送“Hello”：
prismcom.exe usb Hello
Now, I wish to, for example use a command program called Temperature.
现在，我希望，例如使用名为温度的命令程序。
temperature
Let's say the program gives your computer's temperature.
假设该程序为您的计算机提供温度。
Your computer is 100 degrees Fahrenheit.
Now, I wish to write the output of temperature to prismcom.exe:
现在，我希望将温度的输出写入priscom.exe：
temperature | prismcom.exe usb
This does not seem to work.
这似乎不起作用。
Yes, I've looked for a solution to this for more than twenty minutes. In all cases, they are either kludges/hacks or a solution for something besides the Windows command line.
是的，我已经为此寻找了二十多分钟的解决方案。在所有情况下，它们要么是 kludges/hacks，要么是 Windows 命令行之外的解决方案。
I would appreciate direction as to how I would pipe the output from temperature to prismcom.
我很感激有关如何将输出从温度管道传输到棱镜通信的指导。
Thanks!
谢谢！
Edit: Prismcom has two arguments. The first will always be 'usb'. Anything that comes after that will be displayed on the sign.
编辑： Prismcom 有两个论点。第一个永远是'usb'。之后的任何内容都会显示在标志上。
采纳答案by Kenny Kerr
Try this. Copy this into a batch file - such as send.bat - and then simply run send.batto send the message from the temperature program to the prismcom program.
尝试这个。将其复制到批处理文件中 - 例如 send.bat - 然后只需运行send.bat即可将消息从温度程序发送到 Prismcom 程序。
temperature.exe > msg.txt
set /p msg= < msg.txt
prismcom.exe usb "%msg%"
回答by Ostati
You can also run exactly same command at Cmd.exe command-line using PowerShell. I'd go with this approach for simplicity...
您还可以使用 PowerShell 在 Cmd.exe 命令行中运行完全相同的命令。为简单起见，我会采用这种方法......
C:\>PowerShell -Command "temperature | prismcom.exe usb"
Please read up on Understanding the Windows PowerShell Pipeline
You can also type in C:\>PowerShellat the command-line and it'll put you in PS C:\>mode instanctly, where you can directly start writing PS.
你也可以C:\>PowerShell在命令行输入，它会立即让你进入PS C:\>模式，在那里你可以直接开始写 PS。
回答by Harry Johnston
This should work:
这应该有效：
for /F "tokens=*" %i in ('temperature') do prismcom.exe usb %i
If running in a batch file, you need to use %%iinstead of just %i(in both places).
如果在批处理文件中运行，则需要使用%%i而不仅仅是%i（在两个地方）。
回答by annoying_squid
Not sure if you are coding these programs, but this is a simple example of how you'd do it.
不确定您是否正在编写这些程序，但这是您如何编写的一个简单示例。
program1.c
程序1.c
#include <stdio.h>
int main (int argc, char * argv[] ) {
printf("%s", argv[1]);
return 0;
}
rgx.cpp
rgx.cpp
#include <cstdio>
#include <regex>
#include <iostream>
using namespace std;
int main (int argc, char * argv[] ) {
char input[200];
fgets(input,200,stdin);
string s(input)
smatch m;
string reg_exp(argv[1]);
regex e(reg_exp);
while (regex_search (s,m,e)) {
for (auto x:m) cout << x << " ";
cout << endl;
s = m.suffix().str();
}
return 0;
}
Compile both then run program1.exe "this subject has a submarine as a subsequence" | rgx.exe "\b(sub)([^ ]*)"
编译两者然后运行 program1.exe "this subject has a submarine as a subsequence" | rgx.exe "\b(sub)([^ ]*)"
The |operator simply redirects the output of program1's printfoperation from the stdoutstream to the stdinstream whereby it's sitting there waiting for rgx.exe to pick up.
该|运算符只是将 program1 的printf操作的输出从stdout流重定向到stdin流，从而它就在那里等待 rgx.exe 接收。
