Linux C：运行系统命令并获取输出？
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C: Run a System Command and Get Output?
提问by jimi hendrix
Possible Duplicate:
How can I run an external program from C and parse its output?
可能的重复：
如何从 C 运行外部程序并解析其输出？
I want to run a command in linux and get the text returned of what it outputs, but I do notwant this text printed to screen. Is there a more elegant way than making a temporary file?
我想在 linux 中运行一个命令并返回它输出的文本，但我不希望将此文本打印到屏幕上。有没有比制作临时文件更优雅的方法？
回答by dirkgently
回答by dirkgently
You want the "popen" function. Here's an example of running the command "ls /etc" and outputing to the console.
你想要“ popen”功能。这是运行命令“ls /etc”并输出到控制台的示例。
#include <stdio.h>
#include <stdlib.h>
int main( int argc, char *argv[] )
{
FILE *fp;
char path[1035];
/* Open the command for reading. */
fp = popen("/bin/ls /etc/", "r");
if (fp == NULL) {
printf("Failed to run command\n" );
exit(1);
}
/* Read the output a line at a time - output it. */
while (fgets(path, sizeof(path), fp) != NULL) {
printf("%s", path);
}
/* close */
pclose(fp);
return 0;
}
回答by Tommy Hui
Usually, if the command is an external program, you can use the OS to help you here.
通常，如果命令是外部程序，您可以使用操作系统来帮助您。
command > file_output.txt
So your C code would be doing something like
所以你的 C 代码会做类似的事情
exec("command > file_output.txt");
Then you can use the file_output.txt file.
然后您可以使用 file_output.txt 文件。
