20常用系統監測指令/程式

#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
17#: Nagios - Server And Network Monitoring
18#: Cacti - Web-based Monitoring Tool
#19: KDE System Guard - Real-time Systems Reporting and Graphing
#20: Gnome System Monitor - Real-time Systems Reporting and Graphing

前面15個大體上來說都是command mode，16則是虛擬執行系統，裡面的資料很多是臨時的，直接用cat抓出來看就是，後面則是GUI或者web的程式

參考資料
http://www.cyberciti.biz/tips/top-linux-monitoring-tools.html