如何从文件传递命令行参数 [英] How to pass command line parameters from a file

问题描述

我有一个从 argv 读取命令行参数的 C 程序.是否可以制作管道将文件内容作为命令行参数重定向到我的程序?假设我有一个包含以下内容的文件 arguments.dat:

I have a C program that reads command line arguments from argv. Is it possible to make a pipe to redirect the contents of a file as command line arguments to my program? Suppose I have a file arguments.dat with this content:

0 0.2 302 0

我希望我的程序被调用:

And I want my program to be called with:

./myprogram 0 0.2 302 0

我尝试了以下方法:

cat arguments.dat | ./myprogram

没有成功.

推荐答案

对于大多数 shell，您可以使用 $(<filename) 将文件内容插入命令行:>

With most shells, you can insert the contents of a file into a command line with $(<filename):

./myprogram $(<arguments.dat)

如果您的 shell 不支持，那么旧的方法之一将起作用:

If your shell doesn't support that, then one of the older ways will work:

./myprogram $(cat arguments.dat)
./myprogram `cat arguments.dat`   # need this one with csh/tcsh

(您确实知道命令行参数和文件输入之间的区别，对吗?您为什么希望将命令行参数通过管道传输到程序中?)

(You do know the difference between command line arguments and file input, right? Why would you expect to pipe command line arguments into a program?)

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