Useful commands Linux/Unix Flavor

Useful commands Linux/Unix Flavor

Top :

$TOP     This will display the top 10 process for eg: CPU & Memory Consumpton

$iostat:
$iostat -t 10 5

This command will provide the information about the disk utilization, Read/Write rate, etc..

$vmstat:
$vmstat -m

This command provide the swap memory utilization report.

$sar System Activity Reporter:

This tool can provide the report about CPU Load, iowait and other useful info at specified intervals.

dmesg:

This command display all the server errors including Hardware, booting, network errors

This command will retrieve the information from log files which located in /var/log

Other Useful commands to collect some info about the server :

runlevel – To Know the Current Run Level

netstat –a – To see the Network sessions

netstat –rn – To View the gateways configured

who / finger – To View the Users logged in detail

ps –ef – To view all the running process and its related files

sestatus – To check SELINUX status

service iptables status – To check firewall status

ifconfig –a – To View the Network cards and IP Address configured
uptime :
This command provide the server up time.
This below commands provide CPU information.
vi /proc/cpuinfo
vi /proc/slabinfo
cat /proc/cpuinfo (CPU)
cat /proc/meminfo (Memory)
cat /proc/cpuinfo   --- To check the number of processers on the server
cat /proc/meminfo --- To check the memory info on the servers (for eg: ram size)
du -sch ---  To check  the size of a directory.