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I was thinking about sth. like initializing max to getconf INT_MINbut there may be negative REAL numbers (-1E20) so this approach wouldn't work either.

Brilliant, Don! I didn't see that x7, took it for $7 (although suspected an empty variable). Soooo - x_oug being the empty string which is -ne "0" yielding the output as posted!

You know you can make THAT statement way more legible and efficient?

Pls post output of echo "$x_oug"

What's the value of x_oug? How do you assign it? Did you run the script with the xtrace option set?