db.printCollectionStats with scale will print errors repeatedly when running with an int <= 0 or a non-numeric value
eg
MongoDB 2.3.2-pre-> db.printCollectionStats(0)
foo
{ "ns" : "test.foo", "ok" : 0, "errmsg" : "scale has to be > 0" }
---
oplogr
{ "ns" : "test.oplogr", "ok" : 0, "errmsg" : "scale has to be > 0" }
---
system.indexes
{ "ns" : "test.system.indexes", "ok" : 0, "errmsg" : "scale has to be > 0" }
---
xs
{ "ns" : "test.xs", "ok" : 0, "errmsg" : "scale has to be > 0" }
---