XXX Remove nawk(1)

@@ -75,14 +75,14 @@
 {
         typeset options=$1
         typeset file_size=$2
         typeset refer_diff=$($ECHO "$refer_size - $estimate_size" | bc)
         refer_diff=$($ECHO "$refer_diff / 1" | bc)
-        refer_diff=$($ECHO "$refer_diff" | $NAWK '{print ($1 < 0) ? ($1 * -1): $1'})
+        refer_diff=$($ECHO "$refer_diff" | $AWK '{print ($1 < 0) ? ($1 * -1): $1'})
         typeset file_diff=$($ECHO "$file_size - $estimate_size" | bc)
         file_diff=$($ECHO "$file_diff / 1" | bc)
-        file_diff=$($ECHO "$file_diff" | $NAWK '{print ($1 < 0) ? ($1 * -1):$1'})
+        file_diff=$($ECHO "$file_diff" | $AWK '{print ($1 < 0) ? ($1 * -1):$1'})
         typeset expected_diff=$(cal_percentage $refer_size)
 
         [[ -z $refer_diff && -z $file_diff && -z $expected_diff ]] && \
             log_fail "zfs send $options failed"
         [[ $refer_diff -le $expected_diff &&  \