negative imperatives

I understand that ne plus perfect subjunctive can be used for negative commands. On one occasion I saw the present subjunctive used. Does this indicate some nuance of meaning?

You’d find it helpful to consult the grammar parts of Latin Prose Composition by North and Hillard, where this sort of thing is neatly laid out.

EDIT. Sorry, N&H do not mention pres.subj. in neg.command. It does occur in early Latin, rarely later. What is the example you saw?

ne nos inducas in tentationem

ne nos inducas in tentationem

Definitely post-Classical Latin.