Linux system monitoring command

I was trying to remember what commands I will have to remember when monitoring performance of a Linux server. Luckily, I found this blog and it has the list of the commands.

The explanation and example on the blog is very good. However, it is too long for me as I will only need to recall the command in the future and don't need to many explanation. Therefore, I think it will be good for me if I summarize the command here for my reference in the future.

Here are the tools:

#1: top - Process Activity Command

#2: vmstat - System Activity, Hardware and System Information

#3: w - Find Out Who Is Logged on And What They Are Doing

#4: uptime - Tell How Long The System Has Been Running

#5: ps - Displays The Processes

#6: free - Memory Usage

#7: iostat - Average CPU Load, Disk Activity

#8: sar - Collect and Report System Activity

#9: mpstat - Multiprocessor Usage

#10: pmap - Process Memory Usage

#11 and #12: netstat and ss - Network Statistics

#13: iptraf - Real-time Network Statistics

#14: tcpdump - Detailed Network Traffic Analysis

#15: strace - System Calls

#16: /proc file system - Various Kernel Statistics

Reference : here