How do I correctly measure current and voltage values in ngspice?

[nsguiamano]

So I have this netlist:

V1 V1_P 0 dc 9V
V2 Q1_E 0 dc -9V
R1 V1_P R1_N 10k
V3 Q3_B 0 0 Sine(0 10m 1k 0 0)
R2 V1_P R2_N 5.1k
Vx R2_N R2_M dc 0V
V4 Q4_B 0 0 Sine(0 -10m 1k 0 0)
R3 V1_P R3_N 5.1k
Vy Q3_E Q3_F dc 0V
Vz R1_N R1_M dc 0V
Q1 R1_M R1_N Q1_E 0 Q2N3904
Q2 Q3_F R1_N Q1_E 0 Q2N3904
Q3 R2_M Q3_B Q3_E 0 Q2N3904
Q4 R3_N Q4_B Q3_E 0 Q2N3904

.model Q2N3904 NPN(Is=6.734f Xti=3 Eg=1.11 Vaf=74.03 Bf=416.4 Ne=1.259
+ Ise=6.734f Ikf=66.78m Xtb=1.5 Br=.7371 Nc=2 Isc=0 Ikr=0 Rc=1
+ Cjc=3.638p Mjc=.3085 Vjc=.75 Fc=.5 Cje=4.493p Mje=.2593 Vje=.75
+ Tr=239.5n Tf=301.2p Itf=.4 Vtf=4 Xtf=2 Rb=10)

.end

for this circuit:

Problem is, whenever I attempt to do commands such as:

print i(Vx)
print v(R2_N)-v(R2_N)

It says that the commands do not exist.

Is there something wrong with my netlist?

 

[FvM]

It says that the commands do not exist

True, The command is .print. You missed the dot. Also the analysis type has to be specified with the print command.

 

[nsguiamano]

I tried doing what you suggested.

.print i(Vx)
.print dc i(Vx)

The same error comes up.