Courtesy of nixpal.com

When you want to check if you have a 32-bit or a 64-bit Linux you can open a Terminal and just type:

file /sbin/init

or

arch

If you prefer to know how much about the RAM you installed on the PC, type:

free -m

or

grep MemTotal /proc/meminfo

for more detailed info you can try:

cat /proc/meminfo

or

grep MemTotal /proc/meminfo

if you prefer to monitor your RAM in real time.

Courtesy of validwebs.com