Know ur System n os

uname
options:
-a, --all print all information, in the following order,
-s, --kernel-name print the kernel name
-n, --nodename   =  sysctl-a | grep kernel.hostname print the network node hostname
-r, --kernel-release   = sysctl-a | grep kernel.osrelease  print the kernel release
-v, --kernel-version  = sysctl-a | grep kernel.version  print the kernel version
-m, --machine print the machine hardware name
-p, --processor print the processor type or "unknown"
-i, --hardware-platform print the hardware platform or "unknown"
-o, --operating-system print the operating system

sysctl -a also gives lot of information