In this post, I’m going to give some list of Linux commands, which is very useful to get system performance monitoring & statistics information.
#Shows and manage the top processes
top
#Show interactive process viewer
htop
#Shows processors related statistics
mpstat
#Shows virtual memory related statistics
vmstat
#Shows I/O statistics
iostat
#Shows the last 100 syslog messages ( use /var/log/messages )
tail 100 /var/log/messages
#Captures & shows all packets on interface eth0
tcpdump -i eth0
#Monitor all traffic on port 80 ( HTTP )
tcpdump -i eth0 ‘port 80’
#List all open files on the system
lsof
#List files opened by user
lsof -u user
#Shows free & used memory ( -h for human readable, -m for MB, -g for GB. )
free -h
#To see periodic updates, execute “df -h”
watch df -h
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