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Why would you use altermod for a corner simulation? Just use the

.lib

command and select the corner you want.

@Tim Edwards we are trying to automate the corner simulation. The idea is to switch between all different corners available.

@Tim Edwards I used it but I got error of model redefinition

@Eslam Morsie As we have discussed, let's use a different methodology.

@Amro Tork ok

The easiest way is just to run ngspice multiple times specifying a different corner for each run. I've done this before and have a complete system on efabless that automates analog characterization. You just create a template SPICE testbench file and put in variables like "$CORNER", and then a script goes and makes substitutions for each corner and runs ngspice, collects data, and processes it using python and/or octave and presents results with matplotlib.

@Tim Edwards That's what we are currently doing.