这里是Ubuntu linux系统；
1 查看CPU的命令
输入命令：
top c
显示：
root@iZ2ze0zuq27nx0z96tt9:~# top c
top - 11:23:30 up 9 min, 1 user, load average: 0.03, 0.04, 0.02
Tasks: 84 total, 1 running, 83 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.7 us, 0.7 sy, 0.0 ni, 98.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 927.4 total, 245.0 free, 190.1 used, 492.3 buff/cache
MiB Swap: 0.0 total, 0.0 free, 0.0 used. 594.5 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
7 root 20 0 0 0 0 I 0.3 0.0 0:00.27 kworker/0:1-events
660 root 10 -10 75568 11720 10284 S 0.3 1.2 0:02.06 AliYunDun
676 root 10 -10 109788 18324 15792 S 0.3 1.9 0:03.36 AliYunDunMonito
1 root 20 0 102624 12452 8468 S 0.0 1.3 0:01.35 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 rcu_gp
4 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 rcu_par_gp
6 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker/0:0H-kblockd
8 root 20 0 0 0 0 I 0.0 0.0 0:00.02 kworker/u4:0-events_power_efficient
9 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 mm_percpu_wq
10 root 20 0 0 0 0 S 0.0 0.0 0:00.05 ksoftirqd/0
11 root 20 0 0 0 0 I 0.0 0.0 0:00.10 rcu_sched
12 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
13 root -51 0 0 0 0 S 0.0 0.0 0:00.00 idle_inject/0
14 root 20 0 0 0 0 S 0.0 0.0 0:00.00 cpuhp/0
15 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kdevtmpfs
16 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 netns
17 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_tasks_kthre
18 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kauditd
19 root 20 0 0 0 0 S 0.0 0.0 0:00.00 khungtaskd
20 root 20 0 0 0 0 S 0.0 0.0 0:00.00 oom_reaper
21 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 writeback
22 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kcompactd0
23 root 25 5 0 0 0 S 0.0 0.0 0:00.00 ksmd
24 root 39 19 0 0 0 S 0.0 0.0 0:00.00 khugepaged
70 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kintegrityd
71 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kblockd
72 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 blkcg_punt_bio
73 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 tpm_dev_wq
如果想看某个进程PID的使用情况，
输入命令：
top -p 660
其中660为PID。
显示：
root@iZ2ze0zuq27nx0z96tt9:~# top -p 660
top - 11:26:14 up 12 min, 1 user, load average: 0.00, 0.02, 0.01
Tasks: 1 total, 0 running, 1 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.7 us, 0.3 sy, 0.0 ni, 99.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 927.4 total, 244.0 free, 191.0 used, 492.3 buff/cache
MiB Swap: 0.0 total, 0.0 free, 0.0 used. 593.5 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
660 root 10 -10 75568 11720 10284 S 0.3 1.2 0:02.69 AliYunDun
2 查看内存的命令
输入命令：
free -m
显示：
root@iZ2ze0zuq27nx0z96tt9:~# free -m
total used free shared buff/cache available
Mem: 927 189 245 2 492 594
Swap: 0 0 0
3 查看磁盘的命令
输入命令：
df -h
显示：
root@iZ2ze0zuq27nx0z96tt9:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 436M 0 436M 0% /dev
tmpfs 93M 700K 93M 1% /run
/dev/vda1 40G 33G 5.2G 87% /
tmpfs 464M 0 464M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 464M 0 464M 0% /sys/fs/cgroup
tmpfs 93M 0 93M 0% /run/user/0