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<@U01819B63HP> 
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I want to print gm of the transistor, please is my expression correct? Is this the right place for the expression? I don't know what exactly I should do

<@U03RHMG2K7G> looks like the expression is correct. Read the ngspice messages, if it can't find the specified gm parameter it will print a warning.
the .dc command is wrong. a .dc usually specifies a voltage source (typically) , a start value, an end value and a step value, like:
`.dc Vin 0 1.8 0.01`

Is this the right place to put the expression?

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ok, now at the ngspic prompt do a `display` command and see if the [gm] parameter you specified is saved.

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According to the other parameters related to m1 the correct path is without the .x1:
`@m.xm1.msky130_fd_pr__nfet_01v8[gm]`

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there is a typo in the [gm] .save: after `..fd_pr` put a double underscore, `__`.

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Yes, you got the transistor [gm] saved, 181 dc points, that is from 0 to 1.8V at 0.01V increments

you can plot the [gm] variable in a waveform viewer

you can do a `print "@m.xm1.msky130_fd_pr__nfet01v8[gm]"` at the ngspice prompt to see the values

Is there a command for that? My waves viewer does not contaim anythig

Is there a way to print just one value for one Vin value?

In this case do the following.
1. set the `Vin` voltage source to the desired voltage value
2. remove the .dc and insert just a `.op` (no parameters)
ngspice will only calculate one operating point and the print instruction will print one value.

Thanks alot for your patience and the ever help!