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Thanks for the advice but I still couldn't get it to quite do what I want it to do. I have added in a loop after some advice from a computer scientist. The updated version of the problematic section...

In my bash script I want to say "if argument 2 is anything except x, y or z, than echo this" (x y and z being words).

So my script looks like this:

if [[ $2 != {x,y,z} ]]
then
echo...