1. Look version of the system:
cat /etc/redhat-release
2. Look kernel version:
uname -r
3. Check system is 32 bit or 64 bit
uname - m
4. Disk:
Partition main partition, extended and logical partitions of points. Can have up to a hard disk . 4 main regions, wherein a position of a primary partition may be extended by replacing partition and an extended partition can have only one hard disk, in this extended partition may be divided into multiple logical partitions.