[Cyclamen]

Wait! You want to get the word "linux" tattooed? As the OS name?

It that's what you meant, the word "linux" is written in katakana only, and it's spelled リヌックス RI- NU- KKU- SU or リナックス RI- NA - KKU - SU, depending on the way it's pronounced.

Keep one thing in mind when writing words in japanese : to double a consonant, as in -KKU, you have to write a small TSU before the KU syllabe.
That means, the TSU you'll be using in your tatoo HAS to be smaller than the other symbols. If it won't, your tatoo will be read "rinatsukusu" instead of "rinakkusu", and will have no meaning.

You can write it horizontally RI- NA- small TSU - KU- SU
or vertically
RI
NA
small TSU
KU
SU