CODEWITHSUNDEEP
shell
XYZ
XYZ

Reputation: 59

Calculate percentage of free memory using bash scripts in linux

I would like to calculate the percentage of free memory using Linux bash shell scipts.

Example:
bash-4.1$ free
              total       used       free     shared    buffers     cached
 Mem:      12223100   11172812    1050288        316     714800     629944
 -/+ buffers/cache:    9828068    2395032
 Swap:      6266872    5852824     414048

Ex. (1050288/12223100) * 100 = %free memory-I want to do this using scripts.

Thanks Puspa

Upvotes: 2

Views: 8103

Answers (1)

d34db33f
d34db33f

Reputation: 73

memfree=`cat /proc/meminfo | grep MemFree | awk '{print $2}'`; 
memtotal=`cat /proc/meminfo | grep MemTotal | awk '{print $2}'`; 
bc -l <<< "$memfree * 100 / $memtotal"

the proc/meminfo file displays everything you should need about memory.

You use grep to isolate the line about Free Memory and Total memory, and store it in variables. Then you use bc -l for the float division.

EDIT: If there is no bc installed, you may use echo : 

echo $(($memfree.0 * 100 / $memtotal))

Upvotes: 5

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