How to output/save gain, bandwidth, phase margin, gain margin using Spectre Language?

As the title implied, using Graphic-based ADE tool as well as ocean script, result can be easily found. But what if I want to use Spectre language, how to achieve this(Screen display or save into a file an simulation result (gain,bandwidth).).  I already have the formula copied from calculator in ADE. I tried to write the result in SpectreFinal which is the stimuli file used as the input of a simulation.

I only know the way of doing it using Hspice like this:

 [CODE].op

.options ingold=2 list node post

.print ac vdb(6) vp(6)

.ac dec 100 0.001 10g

* net 6 = /out

.MEAS AC gain MAX vdb(6)                     *gain

.MEAS AC bandwidth WHEN vdb(6)=0                    *Unity Gain Frequency (Bandwidth)

.MEAS AC PM FIND PAR('180+vp(6)') WHEN vdb(6)=0     *Phase Margin 180+phase

.MEAS AC GM FIND PAR('0-vdb(6)') WHEN vp(6)=0   *Gain Margin

.end[/CODE]

 My current Spectre based file (spectreFinal) with partial section displayed here:

 [CODE]opBegin  dc  oppoint=rawfile  save=allpub  maxiters=150

+          maxsteps=10K  annotate=status  write="spectre.dc"

acSweep    ac  start=1.0  stop=1e9  annotate=status save=selected

modelParameter info what=model where=file file = "./info.what0"

element info what=models where=file file = "./info.what1"

outputParameter info what=output where=file file = "./info.what2"[/CODE]

The gain from calculator is like this:

[CODE]*Gain = value(dB20((VF("/vout") / (VF("/1") - VF("/2")))) 2)[/CODE]

 How to edit the attached spectreFinal such that I could output the gain into a file using Spectre language?

Thanks,