在C程序中获取系统命令输出 [英] Get system command output in C program

问题描述

有没有更好的方法?

int numOfCPU;
system("grep -c ^processor /proc/cpuinfo >> /tmp/cpuinfo");
FILE *fp = fopen("/tmp/cpuinfo", "r");
fscanf(fp, "%d", &numOfCPU);
fclose(fp);
system("rm /tmp/cpuinfo");

我不想创建中间文件然后将其删除.

I don't want to create an intermediary file and then remove it.

这不是从文件中读取.命令可以是ls"或echo 'Hello world'"

Its not about reading from the file. The command can be "ls" or "echo 'Hello world'"

推荐答案

好的，我对其他答案感到困惑.无论如何，这个答案中的哲学是相同的.您可以直接使用 popen 函数.

Ok, I was confused in my other answer. In any case, the philosophy in this answer is the same. You can use directly the popen function.

然后你有这样的东西:

int numOfCPU;
FILE *fp = popen("grep -c ^processor /proc/cpuinfo", "r");

fscanf(fp, "%d", &numOfCPU);
pclose(fp);

希望对你有用.

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