Get RAM Memory in Terminal

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#1

How can i get the RAM Memory on system in terminal when i have 3 GB with an output like this:

3072
or
3145728
or
3221225472

Anyone knows this?
Just without MB in back of it, only the numbers. in MB, KB or B?

Thanks in Advance.

#2 
grep 'MemTotal' /proc/meminfo

You have to cut off a few things there if you like.

#3

thanks, i was looking for this, now i can use sed to cut out so i only have the numbers

#4

You are welcome.

#5

how to edit the output of this directly with sed or awk?

#6 
grep 'MemTotal' /proc/meminfo | sed -e 's/MemTotal://' -e 's/ kB//'
#7

Can i set this as a integer variable? I now have this.

declare -i num=grep 'MemTotal' /proc/meminfo | sed -e 's/MemTotal://        ' -e 's/ kB//'
#8

To get rid of the spaces in front:

grep 'MemTotal' /proc/meminfo | sed -e 's/MemTotal: *//' -e 's/ kB//'

To get this in an integer* num*:

declare -i num=$(grep 'MemTotal' /proc/meminfo | sed -e 's/MemTotal: *//' -e 's/ kB//')
#9 
declare -i num=$(free | awk '/Mem/{print $2}')

or (using a single sed command):

declare -i num=$(sed -n 's/MemTotal: *\(.*\) kB/\1/p' /proc/meminfo)