appendwrite

must be set after the

wrdata

, otherwise your text.txt file keeps growing. For saving temperature I add the following device (

vsource_arith.sym

in xschem):

et temperat 0 vol='temper'

and use

temperat

as the variable to save. test.cir

test
.param VCCGAUSS=agauss(3, 0.2, 1)
.param TEMPGAUSS = agauss(40, 30, 1)
v1 1 0 'VCCGAUSS'
r1 1 0 1k
et temperat 0 vol='temper'
.option temp = 'TEMPGAUSS'

.option savecurrents
.control

  set wr_vecnames
  set wr_singlescale
  let run = 0

  dowhile run < 10
    reset
    save all
    op
    remzerovec
    wrdata ~/test.txt i(v1) v(1) temperat
    if run eq 0
      set appendwrite
      set wr_vecnames = FALSE
    end
    let run = run + 1
  end
.endc

test.txt

V(1)            i(v1)           v(1)            temperat
 2.45772633e+00 -2.45772633e-03  2.45772633e+00  3.78824124e+01 
 3.10929679e+00 -3.10929679e-03  3.10929679e+00  5.60570694e+01 
 3.17694682e+00 -3.17694682e-03  3.17694682e+00  6.36589293e+01
 3.30505948e+00 -3.30505948e-03  3.30505948e+00 -8.22103055e+00
 2.82714181e+00 -2.82714181e-03  2.82714181e+00  5.38148760e+01
 3.04629013e+00 -3.04629013e-03  3.04629013e+00  8.11912411e+01
 2.67778127e+00 -2.67778127e-03  2.67778127e+00  4.24921319e+01
 2.76318961e+00 -2.76318961e-03  2.76318961e+00  4.48915296e+01
 3.19722314e+00 -3.19722314e-03  3.19722314e+00 -7.51519555e+00
 3.26020513e+00 -3.26020513e-03  3.26020513e+00  4.25405339e+01