Bash script to get mongoStats - bash

Question

Hoping someone has a bash script handy that will hit a mongodb and get the collection stats something like the below that I can use in a shell script?
var collectionNames = db.getCollectionNames(), stats = [];
collectionNames.forEach(function (n) { stats.push(db[n].stats()); });
stats = stats.sort(function(a, b) { return b['size'] - a['size']; });
for (var c in stats) { print(stats[c]['ns'] + ": " + stats[c]['size'] + " (" + stats[c]['storageSize'] + ")"); }
UPDATE
one other question --- looking to prefix the line with a datestamp
"db.getCollectionNames().forEach(function (n) { var s = db[n].stats(); print('date +'%D %r %Z'''namespace=' + s['ns'] +',count=' + s['count']+',avgObjSize=' + s['avgObjSize']+',storageSize=' + s['storageSize']) })"
but my date code doesn't seem to be working :(

Answer 1

mongo $DB_NAME --quiet --eval "db.getCollectionNames().forEach(function (n) { var s = db[n].stats(); print(s['ns'] + ',' + s['size'] + ',' + s['storageSize']) })" | sort --numeric-sort --reverse
It will print in a CSV format which you can you couple of tools to manipulate.
Update:
Just add avgObjSize, totalIndexSize and other keys you need, edit your main question with an output example so we can sort by whatever column you desire.
Update 2:
db.getCollectionNames().forEach(function (n) { var s = db[n].stats(); printjson({'namespace': s['ns'], 'size': s['size'], 'storage': s['storageSize']}) })
db.getCollectionNames().forEach(function (n) { var s = db[n].stats(); print('size=' + s['size'] +',avgObjSize=' + s['avgObjSize']) })