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#!/usr/bin/env bash
mem_info=$(</proc/meminfo)
mem_info=$(echo $(echo $(mem_info=${mem_info// /}; echo ${mem_info//kB/})))
for m in $mem_info; do
case ${m//:*} in
"MemTotal") usedmem=$((usedmem+=${m//*:})); totalmem=${m//*:} ;;
"ShMem") usedmem=$((usedmem+=${m//*:})) ;;
"MemFree"|"Buffers"|"Cached"|"SReclaimable") usedmem=$((usedmem-=${m//*:})) ;;
esac
done
usedmem=$((usedmem / 1024))
totalmem=$((totalmem / 1024))
mem="${usedmem}MB / ${totalmem}MB"
## Complete summary
if [[ $1 = "-fi" ]]; then
echo " $mem"
elif [[ $1 = "-f" ]]; then
echo "$mem"
## Only used RAM
elif [[ $1 = "-i" ]]; then
echo " $usedmem MB"
else
echo "$usedmem MB"
fi
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