类似的例子:
$ man head
......
-n, --lines=[-]K
print the first K lines instead of the first 10; with the leading `-', print all but the
last K lines of each file
这里的 --lines=3 应该就相当于 --options_file options.txt
$ head --lines=3 test.c
#include <stdio.h>
#include <pthread.h>
#include <unistd.h>