[Linux Shell] CentOS Some use shell management commands Collection (1) Continuous update

Check the system version rpm -q centos-release

View the kernel
uname -r

View the top 10 processes currently occupying the largest memory 
ps aux |sort -nrk 4 |head -n 10

View the top 10 processes currently occupying cpu
ps aux |sork -nrk 3 | head -n 10

top command

Enter capital P in top command mode, and the results will be sorted in descending order of CPU usage. Enter a capital M, and the results are sorted in descending order of memory usage. (Note: The uppercase P can be entered in the capslock state, or press Shift+p)

nc command

1 Check if the port can be accessed
 nc -z -v 47.107.44.58 22

Check if the system is trying to log in.
 lastb

Check the system's recent successful login system record
last

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