negative imperatives

[spqr]

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?

[mwh]

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?

[spqr]

ne nos inducas in tentationem

[Hylander]

ne nos inducas in tentationem

Definitely post-Classical Latin.