Scripts I've found useful while working with MongoDB

ShowWiredTigerBackingFiles.js

/***********
* Useful for finding out which xxxxxxx.wt files represent a collection in the dbpath
*
* output sample:
* admin.system.users - statistics:table:collection-14--2861149510510481026
* admin.system.version - statistics:table:collection-9--2861149510510481026
* local.me - statistics:table:collection-2--2861149510510481026
* local.oplog.rs - statistics:table:collection-4--2861149510510481026
* local.replset.election - statistics:table:collection-12--2861149510510481026
* local.replset.minvalid - statistics:table:collection-7--2861149510510481026
* local.startup_log - statistics:table:collection-0--2861149510510481026
* local.system.replset - statistics:table:collection-5--2861149510510481026
* test.test1 - statistics:table:collection-0-6090637249784447374
* test.test2 - statistics:table:collection-2-6090637249784447374
/********
db.adminCommand({listDatabases: 1}).databases.forEach(function(d) {
    var database = db.getSiblingDB(d.name);  
    database.getCollectionNames().forEach(function(c) { 
        print(d.name + "." + c + " - " + database.getCollection(c).stats().wiredTiger.uri);
    });
})