Simple Note System, version 2
Error Code Reference

General-------------------------------------------------------------------------
ERR_NO_ARGS             10  No arguments were specified
ERR_NO_OP               20  No operation was specified
ERR_NO_NOTE             30  A required argument was not provided

Encryption----------------------------------------------------------------------
ERR_NO_GPG              100 Encryption is enabled, but GPG is not installed
ERR_NO_KEY              110 Encryption is enabled, but no recipient was specified

Create--------------------------------------------------------------------------
ERR_NOTE_EXiSTS         200 The specified note already exists