linux常用命令

1.查看linux机器属于物理机/虚拟机

参考：https://www.cnblogs.com/klb561/p/10527197.html

[root@dbaas-test-control-1 ~]# dmesg|grep -i virtual
[    0.000000] Booting paravirtualized kernel on KVM    包含这个，说明虚拟机
[    0.198686] KVM setup paravirtual spinlock
[    0.746127] input: VirtualPS/2 VMware VMMouse as /devices/platform/i8042/serio1/input/input2
[    0.746397] input: VirtualPS/2 VMware VMMouse as /devices/platform/i8042/serio1/input/input3
[    0.759869] systemd[1]: Detected virtualization kvm.
[    0.787907] systemd[1]: Starting Setup Virtual Console...

2.生成指定大小的文件

例如生成50M大小的文件

dd if=/dev/zero of=50M.file bs=1M count=50