linux c 获取console 结果

getLine(char *line, const char *cmd) {
  FILE *pf = popen(cmd, "r");
  if (pf == NULL) {
    return -;
  }
  fgets(line, , pf);
  if (strlen(line) > ) {
    if (line[strlen(line) - ] == '\n')
      line[strlen(line) - ] = '\0';
  }
  pclose(pf);
  return ;
}