memory en linux

[guif]

I would like to know the % free memory and the % busy. Is it possible with bash?
I have this:


#! /bin/bash
clear

MEMTOTAL=`free | grep Mem | awk '{ print $2 }'`
MEMUSED=`free | grep Mem | awk '{ print $3 }'`
MEMFREE=`free | grep Mem | awk '{ print $4 }'`

echo "Total: "`expr $MEMTOTAL / 1024`"Mb" "($MEMTOTAL Kb)"> file.txt
echo "Usada: "`expr $MEMUSED / 1024`"Mb" "($MEMUSED Kb)" >> file.txt
echo "Libre: "`expr $MEMFREE / 1024`"Mb" "($MEMFREE Kb)" >> file.txt
echo " " >> file.txt
more "file.txt"


thanks!

[burschik]

free | awk '/^Mem:/ { print "used: " 100*$3/$2 "%  free: " 100*$4/$2 "%"; }'

[guif]

i change a little:

[guif@jirabck Escritorio]$ free | awk '/Mem:/ {print "used: " 100*$3/$2 "%";}'
used: 97,2066%
[guif@jirabck Escritorio]$
[guif@jirabck Escritorio]$ free | awk '/Mem:/ {print "free: " 100*$4/$2 "%";}'
free: 2,79499%

this is correct???

and, in my code:

echo "`expr $MEMTOTAL / $MEMFREE`"%"

this is the used memory??? the result is different!