如何在C++/Linux中执行外部命令？

#include<iostream>
#include<stdio.h>

int main() {
    FILE *fp;
    char path[1035];

    fp = popen("which ls", "r");
    if (fp == NULL) {
        printf("Failed to run command\n" );
        return 1;
    }

    fgets(path, sizeof(path)-1, fp);
    if (pclose(fp) != 0) {
        printf("Command not found or exited with error status\n");
        return 1;
    }

    printf("The command is located at %s\n", path);
    return 0;
}