[Dev-C++] General Linux question

[Andre` N. C. <ca...@op...>]

Ok I got a Linux question in DOS their is a mem command and a msd command mem allows you to see total RAM used - free etc...  MSD gives the stats of the systems hard ware.  Does linux have any similar commands?  Also does linux support usb? any one know of a good online resource for common linux commands?  If it's important I'm using Caldera open, I'm in the process of downloading Redhat but thats gonna take a while:)