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Try: if [ ! -f file ]; then
echo "/path/.../" >> bad.txt
fi

nawk '{if($0>1){printf("%s\n",$0) >> "ok.txt" }else{printf("%s\n",$0) >> "bad.txt"}}' inputfile

they're 2 diff implementations with diff capabilities. I prefer using ksh for scripting and bash for the interactive sessions as ksh has been more widely available.

as ksh doesn't support the...

read a b < temp
if [ "${a}" -le "${b}" ]; then
echo OK
else
echo NO
fi

external utilities like awk/cut/sed are efficient when run on batches of data, but using them to operate on single lines is extremely wasteful. They take time to load and quit; imagine only being...

x=$(awk '{print $2}' a)
echo $x