Home Router Command Line??

OK,

so I understand that router are linux embedded devices, but the commands are different cause they use mips, mipsel, arm, etc.....and I have been on google trying to research if I could learn the command line for theses different types of routers....I guess more specifically my questions would be how to find out if the router is usings mips, mipsel or arm..etc... because I know for a fact that using uname -m or uname -a doesn't tell you anything so the commands have to be different don't they??