free -m && awk == nice

[bash]
#!/bin/sh
OFF="$1"
UNIT="$2"

OUTPUT_FROM_DF_AND_AWK=$(free -m | awk ’IF NR == 2 {print $4"%s%s"$2"%s\n"}’)

for LINE in $OUTPUT_FROM_DF_AND_AWK
do
printf $LINE "$UNIT" "$OFF" "$UNIT";echo " ";