On startup, jug reads the file ~/.jug/configrc (if it exists). It expects an .ini format file. It can have the following fields:
[main] jugdir=%(jugfile).jugdata jugfile=jugfile.py [status] cache=off [execute] aggressive-unload=False pdb=False wait-cycle-time=12 nr-wait-cycles=150
These have the same meaning as the analogous command line options. If both are given, the command line takes priority.