STYLE: use shell 'command' instead of 'which' in tutorials

tutorials/combustion/chemFoam/gri/validation/createGraph

 #!/bin/sh
 
-if ! which gnuplot > /dev/null 2>&1
-then
-    echo "gnuplot not found - skipping graph creation" >&2
+command -v gnuplot >/dev/null 2>&1 || {
+    echo "gnuplot not found - skipping graph creation" 1>&2
     exit 1
-fi
+}
 
 gnuplot<<EOF
     set terminal postscript eps color enhanced "Helveicta,20"

tutorials/combustion/chemFoam/h2/validation/createGraph

 #!/bin/sh
 
-if ! which gnuplot > /dev/null 2>&1
-then
-    echo "gnuplot not found - skipping graph creation" >&2
+# Test if gnuplot exists on the system
+command -v gnuplot >/dev/null 2>&1 || {
+    echo "gnuplot not found - skipping graph creation" 1>&2
     exit 1
-fi
+}
 
 gnuplot<<EOF
     set terminal postscript eps color enhanced "Helvetica,20"

tutorials/combustion/chemFoam/ic8h18/validation/createGraph

 #!/bin/sh
 
-if ! which gnuplot > /dev/null 2>&1
-then
-    echo "gnuplot not found - skipping graph creation" >&2
+# Test if gnuplot exists on the system
+command -v gnuplot >/dev/null 2>&1 || {
+    echo "gnuplot not found - skipping graph creation" 1>&2
     exit 1
-fi
+}
 
 gnuplot<<EOF
     set terminal postscript eps color enhanced "Helvetica,20"

tutorials/combustion/chemFoam/ic8h18_TDAC/validation/createGraph

 #!/bin/sh
 
-if ! which gnuplot > /dev/null 2>&1
-then
-    echo "gnuplot not found - skipping graph creation" >&2
+# Test if gnuplot exists on the system
+command -v gnuplot >/dev/null 2>&1 || {
+    echo "gnuplot not found - skipping graph creation" 1>&2
     exit 1
-fi
+}
 
 gnuplot<<EOF
     set terminal postscript eps color enhanced "Helvetica,20"

tutorials/combustion/chemFoam/nc7h16/validation/createGraph

 #!/bin/sh
 
-if ! which gnuplot > /dev/null 2>&1
-then
-    echo "gnuplot not found - skipping graph creation" >&2
+# Test if gnuplot exists on the system
+command -v gnuplot >/dev/null 2>&1 || {
+    echo "gnuplot not found - skipping graph creation" 1>&2
     exit 1
-fi
+}
 
 gnuplot<<EOF
     set terminal postscript eps color enhanced "Helvetica,20"

tutorials/combustion/fireFoam/LES/compartmentFire/validation/createGraphs

@@ -53,12 +53,11 @@ EOF
 }
 
 
-# test if gnuplot exists on the system
-if ! which gnuplot > /dev/null 2>&1
-then
-    echo "gnuplot not found - skipping graph creation" >&2
+# Test if gnuplot exists on the system
+command -v gnuplot >/dev/null 2>&1 || {
+    echo "gnuplot not found - skipping graph creation" 1>&2
     exit 1
-fi
+}
 
 SETSDIRT="../postProcessing/thermoCouple"
 

tutorials/heatTransfer/buoyantSimpleFoam/buoyantCavity/validation/createGraphs

@@ -85,20 +85,18 @@ EOF
 
 echo "createGraphs:"
 
-# test if gnuplot exists on the system
-if ! which gnuplot > /dev/null 2>&1
-then
-    echo "FOAM FATAL ERROR: gnuplot not found - skipping graph creation" >&2
+# Test if gnuplot exists on the system
+command -v gnuplot >/dev/null 2>&1 || {
+    echo "FOAM FATAL ERROR: gnuplot not found - skipping graph creation" 1>&2
     exit 1
-fi
+}
 
 SETSDIR="../postProcessing/sample"
 
-if [ ! -d $SETSDIR ]
-then
-    echo "FOAM FATAL ERROR: result sets not available in directory $SETSDIR" >&2
+[ -d "$SETSDIR" ] || {
+    echo "FOAM FATAL ERROR: result sets not available in directory $SETSDIR" 1>&2
     exit 1
-fi
+}
 
 # paths to data
 LATESTTIME=$(ls $SETSDIR)

tutorials/heatTransfer/chtMultiRegionSimpleFoam/jouleHeatingSolid/createGraphs

@@ -30,28 +30,25 @@
 #     Joule heating case
 #
 #------------------------------------------------------------------------------
-
 cd ${0%/*} || exit 1    # Run from this directory
 
 # Stop on first error
 set -e
 
-# test if gnuplot exists on the system
-if ! which gnuplot > /dev/null 2>&1
-then
-    echo "FOAM FATAL ERROR: gnuplot not found - skipping graph creation" >&2
+# Test if gnuplot exists on the system
+command -v gnuplot >/dev/null 2>&1 || {
+    echo "FOAM FATAL ERROR: gnuplot not found - skipping graph creation" 1>&2
     exit 1
-fi
+}
 
 
 echo "Creating graph"
 OFDATA='postProcessing/sample1/solid/20000/centreLine_T_jouleHeatingSource:V_jouleHeatingSource:sigma.xy'
 
-if [ ! -f "$OFDATA" ]
-then
-    echo "FOAM FATAL ERROR: OpenFOAM results not available in $OFDATA" >&2
+[ -f "$OFDATA" ] || {
+    echo "FOAM FATAL ERROR: OpenFOAM results not available in $OFDATA" 1>&2
     exit 1
-fi
+}
 
 gnuplot<<EOF
 set terminal postscript eps color enhanced

tutorials/incompressible/boundaryFoam/boundaryWallFunctionsProfile/Allrun

@@ -36,12 +36,11 @@ done
 
 
 # create validation plot
-# test if gnuplot exists on the system
-if ! which gnuplot > /dev/null 2>&1
-then
-    echo "gnuplot not found - skipping graph creation" >&2
+# Test if gnuplot exists on the system
+command -v gnuplot >/dev/null 2>&1 || {
+    echo "gnuplot not found - skipping graph creation" 1>&2
     exit 1
-fi
+}
 
 graphName="OF_vs_ANALYTICAL.eps"
 

tutorials/incompressible/pimpleFoam/laminar/planarPoiseuille/validation/createGraph

@@ -3,11 +3,11 @@
 tail -n +4 ../postProcessing/probes/0/U  | \
     tr -s " " | tr -d '(' | cut -d " " -f2-3 > ../Numerical.dat
 
-if ! which gnuplot > /dev/null 2>&1
-then
-    echo "gnuplot not found - skipping graph creation" >&2
+# Test if gnuplot exists on the system
+command -v gnuplot >/dev/null 2>&1 || {
+    echo "gnuplot not found - skipping graph creation" 1>&2
     exit 1
-fi
+}
 
 gnuplot<<EOF
     set terminal postscript eps color enhanced "Helvetica,20"

tutorials/incompressible/simpleFoam/T3A/validation/createGraphs

 #!/bin/sh
 
-if ! which gnuplot > /dev/null 2>&1
-then
-    echo "gnuplot not found - skipping graph creation" >&2
+# Test if gnuplot exists on the system
+command -v gnuplot >/dev/null 2>&1 || {
+    echo "gnuplot not found - skipping graph creation" 1>&2
     exit 1
-fi
+}
 
 gnuplot<<EOF
     set term post enhanced color solid linewidth 2.0 20