diff --git a/tutorials/combustion/chemFoam/gri/validation/createGraph b/tutorials/combustion/chemFoam/gri/validation/createGraph
index 53078e0719..9e97ecfd50 100755
--- a/tutorials/combustion/chemFoam/gri/validation/createGraph
+++ b/tutorials/combustion/chemFoam/gri/validation/createGraph
@@ -1,9 +1,10 @@
 #!/bin/sh
 
-type -P gnuplot &>/dev/null || {
+if ! which gnuplot > /dev/null 2>&1
+then
     echo "gnuplot not found - skipping graph creation" >&2
     exit 1
-}
+fi
 
 gnuplot<<EOF
     set terminal postscript eps color enhanced "Helveicta,20"
diff --git a/tutorials/combustion/chemFoam/h2/validation/createGraph b/tutorials/combustion/chemFoam/h2/validation/createGraph
index 3d94e32410..0053df1a9b 100755
--- a/tutorials/combustion/chemFoam/h2/validation/createGraph
+++ b/tutorials/combustion/chemFoam/h2/validation/createGraph
@@ -1,9 +1,10 @@
 #!/bin/sh
 
-type -P gnuplot &>/dev/null || {
+if ! which gnuplot > /dev/null 2>&1
+then
     echo "gnuplot not found - skipping graph creation" >&2
     exit 1
-}
+fi
 
 gnuplot<<EOF
     set terminal postscript eps color enhanced "Helvetica,20"
diff --git a/tutorials/combustion/chemFoam/ic8h18/validation/createGraph b/tutorials/combustion/chemFoam/ic8h18/validation/createGraph
index fc11ca2a7a..9019192823 100755
--- a/tutorials/combustion/chemFoam/ic8h18/validation/createGraph
+++ b/tutorials/combustion/chemFoam/ic8h18/validation/createGraph
@@ -1,9 +1,10 @@
 #!/bin/sh
 
-type -P gnuplot &>/dev/null || {
+if ! which gnuplot > /dev/null 2>&1
+then
     echo "gnuplot not found - skipping graph creation" >&2
     exit 1
-}
+fi
 
 gnuplot<<EOF
     set terminal postscript eps color enhanced "Helvetica,20"
diff --git a/tutorials/combustion/chemFoam/nc7h16/validation/createGraph b/tutorials/combustion/chemFoam/nc7h16/validation/createGraph
index 2302a2fe42..ab1432022f 100755
--- a/tutorials/combustion/chemFoam/nc7h16/validation/createGraph
+++ b/tutorials/combustion/chemFoam/nc7h16/validation/createGraph
@@ -1,9 +1,10 @@
 #!/bin/sh
 
-type -P gnuplot &>/dev/null || {
+if ! which gnuplot > /dev/null 2>&1
+then
     echo "gnuplot not found - skipping graph creation" >&2
     exit 1
-}
+fi
 
 gnuplot<<EOF
     set terminal postscript eps color enhanced "Helvetica,20"
diff --git a/tutorials/heatTransfer/buoyantSimpleFoam/buoyantCavity/validation/createGraphs b/tutorials/heatTransfer/buoyantSimpleFoam/buoyantCavity/validation/createGraphs
index 3cdb4dfc66..192f3d6340 100755
--- a/tutorials/heatTransfer/buoyantSimpleFoam/buoyantCavity/validation/createGraphs
+++ b/tutorials/heatTransfer/buoyantSimpleFoam/buoyantCavity/validation/createGraphs
@@ -78,10 +78,11 @@ EOF
 
 
 # test if gnuplot exists on the system
-type -P gnuplot &>/dev/null || {
+if ! which gnuplot > /dev/null 2>&1
+then
     echo "gnuplot not found - skipping graph creation" >&2
     exit 1
-}
+fi
 
 SETSDIR="../postProcessing/sets"
 
diff --git a/tutorials/incompressible/boundaryFoam/boundaryWallFunctionsProfile/Allrun b/tutorials/incompressible/boundaryFoam/boundaryWallFunctionsProfile/Allrun
index d30f1362fc..9377ab7822 100755
--- a/tutorials/incompressible/boundaryFoam/boundaryWallFunctionsProfile/Allrun
+++ b/tutorials/incompressible/boundaryFoam/boundaryWallFunctionsProfile/Allrun
@@ -41,10 +41,12 @@ done
 
 # create validation plot
 # test if gnuplot exists on the system
-type -P gnuplot &>/dev/null || {
+if ! which gnuplot > /dev/null 2>&1
+then
     echo "gnuplot not found - skipping graph creation" >&2
     exit 1
-}
+fi
+
 graphName="OF_vs_ANAYTICAL.eps"
 
 echo "Creating graph of u+ vs y+ to $graphName"
diff --git a/tutorials/lagrangian/MPPICFoam/cyclone/Allrun b/tutorials/lagrangian/MPPICFoam/cyclone/Allrun
index 0ee008964e..aafb01639e 100755
--- a/tutorials/lagrangian/MPPICFoam/cyclone/Allrun
+++ b/tutorials/lagrangian/MPPICFoam/cyclone/Allrun
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 cd ${0%/*} || exit 1