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Input:
Solve the equation $x^2=5$. Prove that $x$ is an irrational number.

Output:
Solve the equation $latex x^2=5$. Prove that $latex x$ is an irrational number.

So the 1st, 3rd, ......

I want to replace all occurences of '$' in a LaTeX source code in the following way: The dollars on odd position in the file must be changed in '$latex ' and the other dollars can remain the same.
...

I can't manage to list all files that are not directories from current directory.

I tried to use expr for multiplication, but got an error. I used '*' symbol. Can you tell me what's the problem, or if there is another way? Thanks