小澤さくです.

最初のほうだけちょっと見ました.

Getting Start
->
Getting Started

First check where or not Ruby is installed
->
First check whether Ruby is installed or not

-v means option to print
->
-v option have ruby print its version.

plathome
->
platform

Ruby is free software so you can get it without
cost and installation is not restricted
->
Ruby is free  software so you can get it with no cost.
Your have no restrictions on installation and its use. (ゆーす:名詞)
HORBみたく「軍事利用不可」なんてことありましたっけ?

Now, let's use ruby.
->
Now, let's play with ruby.

c	only syntax checking
->
c	syntax checking only

e	to specify ...
->
e	specifies ... (ほかの to VERBも三単現のほうがいいと思う)

i	instant editing
->
i	in-place editing mode(Perlではin-place editと呼んでるみたい)

For example
% ruby ...
it means
->
For example,
% ruby ...
means (itをとる)

for all C files and preserve the original file with naming '.bak' file.
->
for all C files, preserving the original ones under names with '.bak' appended.

-- 
小澤索郎 - DCI Certified Judge Level II -
<mailto:crouton / po.shiojiri.ne.jp>
<http://www.shiojiri.ne.jp/%7Ecrouton/>