Summary of information or troubleshooting commands under Linux systems

1. Check the user's online and login status

W-View Online users

Last-View recent user logins

2. View System command Execution history

History

3. View the process information that the system is running now

Pstree-a (simple result)

PS aux (Detailed results)

4. View network connection Information

Netstat-ntlp

Netstat-nulp

Netstat-nxlp

5. View CPU and Memory run information

Free-m # View Current Memory usage

Uptime # to see how long the system is running

Top # View System process information (dynamic)

6. View hardware Information

LSPCI # View All PCI devices

Dmidecode

7. View mount point and file system

Mount

Cat/etc/fstab

Df-h

PVs

VGs

Lvs

8. System logs and kernel messages

Dmesg

Less/var/log/message

Less/var/log/secure

Less/var/log/auth

9. View Scheduled Tasks

ls/etc/cron* + Cat

Summary of information or troubleshooting commands under Linux systems