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Confused on how to script item

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# 1  
Old 04-09-2014
Confused on how to script item
I am working on a script that will parse the /proc/meminfo file and return values. I have been able to pull the MemTotal and MemFree from that file but have stumbled on the next thing I want to do - calculate memory used via subtracting MemFree from MemTotal.

Would I do something like -
Code:
memfree=$(more /proc/meminfo | grep MemFree
memtotal=$(more /proc/meminfo| grep MemTotal
Let usedmem=$memtotal-$memfree

echo "Total Memory: $memtotal  Free Memory: $memfree  Memory in use: $usedmem

that? If not, what would be the best method to do this calculation?
# 2  
Old 04-09-2014
Code:
usedmem=$((memtotal - memfree))

# 3  
Old 04-09-2014
Remember that cached counts as free, too.
# 4  
Old 04-09-2014
Thank you! I added that to my script and it works.
# 5  
Old 04-09-2014
I'm not sure above will work as the values might have a header with them. Try
Code:
grep  ^Mem /proc/meminfo | { read X MEMTOT R;read X MEMFRE R; echo $MEMTOT $MEMFRE $((MEMTOT-MEMFRE)); }

# 6  
Old 04-09-2014
My script is complete and does exactly what I want it to do. Thank you once more!
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