linux - In which condition "nice" command's return value will be 33? -

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"nice" command returning value 33. please me understand why nice returning value 33. in systems works fine giving return value 0 on system gives me return value 33. 

    nice -n -10 <doing process here>      returnvalue=$?

here returnvalue gets value 33 in spite of 0.

it looks nice(1) returning exit code of niced command*. try

nice bash -c 'exit 13' ; echo $?

and 13. niced command got exit code of 33. can't tell how that happen, because don't tell command nicing. btw, shells might have nice builtin might use explicitly /usr/bin/nice instead of nice

note *: when nice fails (e.g. nice -n -12 id without being root), says stderr exit 0


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