操作方法
free工具的一些参数选项：[root@searu ~]# free --help free: invalid option -- - usage: free [-b|-k|-m|-g] [-l] [-o] [-t] [-s delay] [-c count] [-V] -b,-k,-m,-g show output in bytes, KB, MB, or GB -l show detailed low and high memory statistics -o use old format (no -/+buffers/cache line) -t display total for RAM + swap -s update every [delay] seconds -c update [count] times -V display version information and exit [root@searu ~]#
free：用于linux中查看当前系统内存的使用情况
free -b 显示输出为字节
free -l 显示详细的低和高内存统计
-s 指定一个时间（秒）来持续更新，-c 指定更新次数