diff --git a/examples/digital/compare/adder_Xspice.cir b/examples/digital/compare/adder_Xspice.cir
index 3461ff99d..5954088d6 100644
--- a/examples/digital/compare/adder_Xspice.cir
+++ b/examples/digital/compare/adder_Xspice.cir
@@ -76,11 +76,7 @@ eprvcd 1 2 3 4 5 6 7 8 s0 s1 s2 s3 c3 > adder_x.vcd
 if $oscompiled = 1 | $oscompiled = 8  ; MS Windows
   shell start gtkwave adder_x.vcd --script nggtk.tcl
 else
-  if $oscompiled = 7 ; macOS, manual tweaking required (mark, insert, Zoom Fit)
-    shell open -a gtkwave adder_x.vcd
-  else ; Linux and others
-    shell gtkwave adder_x.vcd --script nggtk.tcl &
-  end
+  shell gtkwave adder_x.vcd --script nggtk.tcl &
 end
 .endc
 
diff --git a/examples/digital/digital_devices/clean.sh b/examples/digital/digital_devices/clean.sh
new file mode 100755
index 000000000..5c94ff0c5
--- /dev/null
+++ b/examples/digital/digital_devices/clean.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+set -x
+rm -v *.vcd
diff --git a/examples/digital/digital_devices/runtests.sh b/examples/digital/digital_devices/runtests.sh
new file mode 100755
index 000000000..0e4d78989
--- /dev/null
+++ b/examples/digital/digital_devices/runtests.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+ngspice -b 7490a.cir
+ngspice -b 74f524.cir
+ngspice -b behav-283-1.cir
+ngspice -b behav-283.cir
+ngspice -b behav-568.cir
+ngspice -b behav-tristate-pulse.cir
+ngspice -b behav-tristate.cir
+ngspice -b counter.cir
+ngspice -b decoder.cir
+ngspice -b encoder.cir
+ngspice -b ex283.cir
+ngspice -b ex4.cir
+ngspice -b ex5.cir
+ngspice -b xspice_c4.cir
diff --git a/examples/xspice/d_process/prog-pipes.cir b/examples/xspice/d_process/prog-pipes.cir
index cffeb352a..95bf8091a 100644
--- a/examples/xspice/d_process/prog-pipes.cir
+++ b/examples/xspice/d_process/prog-pipes.cir
@@ -13,7 +13,7 @@ a1 1 clk1 d_osc1
 a2 2 clk2 d_osc1 
 
 ap0_4 null clk1 null [q1 q2 q3 q4] proc0
-.model proc0 d_process (process_file="graycode|" process_params=["--pipe"])
+.model proc0 d_process (process_file="graycode|")
 
 ap1_4 [clk2] clk1 null [o1 o2 o3 o4] proc1
 .model proc1 d_process (process_file="prog1in4out" process_params=["opt1", "qwerty"])
diff --git a/examples/xspice/d_process/prog1-4.cir b/examples/xspice/d_process/prog1-4.cir
index 7f3a8ca91..fd7e2d9e0 100644
--- a/examples/xspice/d_process/prog1-4.cir
+++ b/examples/xspice/d_process/prog1-4.cir
@@ -37,11 +37,7 @@ eprvcd clk1 clk2  o1 o2 o3 o4 q1 q2 q3 q4 b1 b2 b3 b4 zeros qzeros reseto > prog
 if $oscompiled = 1 | $oscompiled = 8  ; MS Windows
   shell start gtkwave prog1-4.vcd --script nggtk.tcl
 else
-  if $oscompiled = 7 ; macOS, manual tweaking required (mark, insert, Zoom Fit)
-    shell open -a gtkwave prog1-4.vcd
-  else ; Linux and others
-    shell gtkwave prog1-4.vcd --script nggtk.tcl &
-  end
+  shell gtkwave prog1-4.vcd --script nggtk.tcl &
 end
 quit
 .endc
diff --git a/examples/xspice/state/state-machine.cir b/examples/xspice/state/state-machine.cir
index 663f14fee..2184b477e 100644
--- a/examples/xspice/state/state-machine.cir
+++ b/examples/xspice/state/state-machine.cir
@@ -34,10 +34,13 @@ write spifsim.raw
 plot cntl out_msb+2 out_lsb+8
 eprvcd n_one clk n_zero msb lsb > spifsim.vcd
 * plotting the vcd file (e.g. with GTKWave)
+if $oscompiled = 1 | $oscompiled = 8  ; MS Windows
 * For Windows: returns control to ngspice
-shell start gtkwave spifsim.vcd --script $inputdir/nggtk.tcl
+  shell start gtkwave spifsim.vcd --script $inputdir/nggtk.tcl
+else
 * Others
-*shell gtkwave spifsim.vcd --script nggtk.tcl &
+  shell gtkwave spifsim.vcd --script nggtk.tcl &
+end
 .endc
 
 .end