Check available RAM in Linux

This will convert any kB lines to MB:

awk '$3=="kB"{$2=$2/1024;$3="MB"} 1' /proc/meminfo | column -t

1	awk '$3=="kB"{$2=$2/1024;$3="MB"} 1' /proc/meminfo \| column -t

This version converts to gigabytes:

awk '$3=="kB"{$2=$2/1024^2;$3="GB";} 1' /proc/meminfo | column -t

1	awk '$3=="kB"{$2=$2/1024^2;$3="GB";} 1' /proc/meminfo \| column -t

For completeness, this will convert to MB or GB as appropriate:

awk '$3=="kB"{if ($2>1024^2){$2=$2/1024^2;$3="GB";} else if ($2>1024){$2=$2/1024;$3="MB";}} 1' /proc/meminfo | column -t

1	awk '$3=="kB"{if ($2>1024^2){$2=$2/1024^2;$3="GB";} else if ($2>1024){$2=$2/1024;$3="MB";}} 1' /proc/meminfo \| column -t