C execute

nodeexe.c

#include <stdlib.h>
#include <string.h>

int main(int argc, char* argv[]) {
    if (argc > 1) {
        char* arg = argv[1];
        char cmdprefix[] = "node app.js -channel demo -url ";
        char* cmd = (char*)malloc(
            strlen(cmdprefix) + strlen(arg) + 1
            /* \0 */
        );
        strcpy(cmd, cmdprefix);
        strcat(cmd, arg);

        system(cmd);

    	free(cmd);
    }
    return 0;
}