1 ) Command to check How much RAM on server .
* cat /proc/meminfo
or
if you are looking for specific information only about Memory info then use below command
* cat /proc/meminfo | awk 'match($1,"MemTotal") == 1 {print $2}'
*** Note: may format of /proc/meminfo varies ****
2 ) Command to display number of CPU in system
* cat /proc/cpuinfo | grep processor | wc -l
3) below command will display the number of CPU sockets
* dmidecode|grep CPU
4) Below command will will display the populated sockets.
* dmidecode|grep Populated
5) COmmand to check Linux version
* cat /proc/version
OR
* uname -r
6 ) Redhat version check
* cat /etc/redhat-release
7) COmmand to check disk space based on different partition.
* df -h
8) Command to list all users on server
* cat /etc/passwd | gawk 'FS=":" {print $1}'
9) Command to list groups on server
cat /etc/group |cut -d: -f1