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1.新的系统调用号定义在../include/unistd.h中。
2.为了在Linux 0.11中顺利进行make，需要在bochs虚拟机中对硬盘作一些调整，如下：
cd /bin
mv sh sh.old
ln bash sh
3.编译
编译所有文件：
make
编译某个文件，如：
make execve2
4.测试
make test
4.清除中间文件
make clean
