一个简单命令，显示下列信息
CPU processes load memory swap network I/O disk I/O file system


sudo yum install saidar

saidar

彩色显示
saidar -c

saidar -c -d 2
两秒刷新一次


可以同时显示多种监控信息的类似工具 
sar nmon dstat  等 

Monitor your Linux Box with the saidar Utility
https://linoxide.com/monitoring-2/monitor-linux-saidar-tool/

https://github.com/libstatgrab/libstatgrab/blob/master/src/saidar/saidar.c


Hostname  : VM_0_16_centos Uptime : 858d 17:53:24     Date : 2020-11-27 08:32:18

Load 1    :   0.04   CPU Idle  :  96.98%  Running   :     2   Zombie    :     0
Load 5    :   0.04   CPU System:   1.01%  Sleeping  :    98   Total     :   100
Load 15   :   0.05   CPU User  :   2.01%  Stopped   :     0   No. Users :     1

Mem Total :   1839M  Swap Total:      0B  Mem Used  : 53.79%  Paging in :     0
Mem Used  :    989M  Swap Used :      0B  Swap Used :         Paging out:    28
Mem Free  :    850M  Swap Free :      0B  Total Used:

Disk Name      Read         Write         Network Interface        rx        tx
vda              0B        28672B         vethd4f60af              0B        0B
vda1             0B        28672B         veth2a44089              0B        0B
sr0              0B            0B         vethc18bd67              0B        0B
                                          veth51c41e6              0B        0B
Total            0B        57344B         eth0                   476B      655B
                                          lo                    9097B     9097B
                                          vetheb89dd0              0B        0B
                                          veth9231fc8              0B        0B
                                          docker0                  0B        0B

                                          Mount Point            Free	   Used
                                          /                    36765M     22.94%
                                          /sys                     0B         -