Some simulations, particularly time domain simulations, can generate large amount of data. The amount of output can be restricted by using the .save directive to save only the specific node voltages and device current of interest.
Syntax: .save V(out) [V(in) [I(L1) [I(S2)]]] [dialogbox]
The directive .save I(Q2) will save the base, collector and emitter currents of bipolar transistor Q2. To save a single terminal current, specify Ic(Q2).
The wildcard characters '*' and '?' can be used to specify data traces matching a pattern. For example, ".save V(*) Id(*)" will save every voltage and every drain current.
If the keyword "dialogbox" is specified, then a dialog box with a list of all-available default nodes and currents is displayed allowing the user to select from the list which should be saved. If the netlist was generated from a schematic, then nodes and devices can be pointed to and clicked on in the schematic to highlight them as selected in the dialog box.