学习linux命令
mysqldump
rsync
gcc命令
makefile
学习sql，了解底层
学习正则表达式
学习shell脚本
change master to change master to master_host=’10.0.3.49’,master_user=’slave’,master_password=’slavepass’,master_log_file=’mysql-bin.000003’,master_log_pos=1927;
rsync命令是一个远程数据同步工具，可通过LAN/WAN快速同步多台主机间的文件。rsync使用所谓的“rsync算法”来使本地和远程两个主机之间的文件达到同步，这个算法只传送两个文件的不同部分，而不是每次都整份传送，因此速度相当快。
gcc 预处理–>汇编–>编译–>链接
-E 将源文件预处理成为 .i 文件。 -S 将源文件汇编成为 .s 文件。 -c 将源文件编译输出 .o 文件。-o 将源文件链接成为可执行文件。
其中 -O1 指的时优化等级，级别为1–3，级别越大，优化效果越好，但编译时间越长。
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