Now I am beginning to understand your frustrations. We assumed
(always a bad thing to do) that you were running some "mainstream" distro.
The linux installed on your device will be a minimal install to save on space (& cost). It will not come with any
development tools (C compiler, kernel source-code etc.) and many basic things like file
will have been omitted, because they are not needed for the device to function
(probably very well, as long as you do not break it).
In short, you are setting yourself a very
hard task if you are new to linux, and want to play with it (IMHO the best way to learn linux is to play with it until you break it, then start again: like a bicycle - at first you keep falling off, but soon you wonder why everybody can't just ride one, the same as you can - it's EASY!).
You may well break the fuctionality of your device if you play with it without knowing what you are doing. Please take care, especially if you are working as root, which you have been doing.
I do not know where you found your lynx
executable, but maybe it was not compiled for your ARM system: linux isn't windows - you can't just drop in an exe file and expect it to work. This is one of the many advantages of linux. (Drop in a virus: it doesn't work. Nothing happens).
If you'd like to learn linux to the level that you can hack linux-powered devices, start with a mainstream distro, and dual-boot with that "other" OS, until you earn your wings.
Start here http://distrowatch.com/
and pick any distro in the top ten. Maybe try them all.
I am currently recommending kubuntu 8.04 but make your own choice, and play as you wish.
Search-engine (or search this board) for dual boot linux
to see what I am talking about.
I'm sure you'll have a lot of fun, and learn to appreciate all linux has to offer. Then
you can play with hacking linux-powered devices.
That's fun too: My jailbroken iTouch! Whooo Hooo! I rarely listen to music, but hacking it was fun.
Explore a mainstream distro. Try others. Have fun. Good luck.