diff --git a/t/test_opts.sh b/t/test_opts.sh
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+ #!/bin/bash
+
+#
+#############################################################################
+#
+# test_opts.sh
+#
+# Script for testing all permutations of command-line options
+#
+# See sampleTest() for how to define your own test
+#
+
+#
+# set these variables for your test environment:
+#
+fio_executable=./fio
+
+#
+# Demonstration of using this script
+# 
+function sampleTest() {
+
+    #
+    # sample test execution
+    #
+    # 1) Create each of your command-line groups (each in a separate array)
+    # 2) List the names of all your groups in one array
+    # 3) Define arguments that are common to all groups (if any)
+    # 4) Call execGroupList
+    #
+    # See getNextCmdLinePermutation() for how the permutation works
+    #
+
+    local numjobs=("numjobs=1" "numjobs=8")
+    local rw=("rw=write" "rw=randrw")
+    local bs=("bs=512" "bs=64K")
+    local thread=("" "thread") # groups can have empty members, to test with and without option
+    local all=("numjobs" "rw" "bs" "thread")
+
+    local commonArgs="-name=test -ioengine=null -size=500M -group_reporting -runtime=5"
+
+    echo -e "\nHere are the permutations of options:\n"
+    printAllPermutations "${all[@]}";
+    echo -e "\nHere are options common to all permutations:\n"
+    echo -e "${commonArgs}\n"
+
+    read -p "Press enter to start tests..."
+
+    execGroupList "test" "$commonArgs" "${all[@]}"
+}
+
+#
+# Iterates the next permutation for groups of command-line options
+#
+# Parameters:
+#
+# $1        Permutation to generate, 0..n-1, where 'n' is the total
+#           number of combinations possible in the groups passed.
+# $2        Array containing list of array names, each of which contains
+#           a group of command-line options
+#
+# Return Value:
+#
+# retVal    Command line string generated
+#
+# Example:
+#
+#   ops=("op=read" "op=write")
+#   sizes=("size=10MB" "size=20MB" "size=50MB")
+#   all=("ops" "sizes")
+#
+#   getNextCmdLinePermutation {0..6} "${all[@]}";
+#
+#   Results for each permutation number passed:
+#
+#   0: "--op=read --size=10MB"
+#   1: "--op=write --size=10MB"
+#   2: "--op=read --size=20MB"
+#   3: "--op=write --size=20MB"
+#   4: "--op=read --size=50MB"
+#   5: "--op=write --size=50MB"
+#   6: "" (invalid permutation #)
+#
+function getNextCmdLinePermutation() {
+
+    local permutationToGet=$1
+    shift
+    local allArgGroups=("$@")
+    local numArgGroups="${#allArgGroups[@]}"
+    local cmdLine=""
+    local groupNum n 
+
+    for ((groupNum=0, n=permutationToGet; groupNum<numArgGroups; groupNum++)); do
+        local -n groupVals="${allArgGroups[groupNum]}"
+        local numItemsInGroup=${#groupVals[@]}
+        local itemIndexInGroup=$((n % numItemsInGroup))
+        local item="${groupVals[itemIndexInGroup]}"
+        if [[ -n $item ]]; then
+            cmdLine+="--${item} "
+        fi # else this is an empty item, ex: args=("" "numjobs=4")
+        n=$((n / numItemsInGroup))
+    done
+    # n==0 if permutation # specified is invalid/beyond groups
+    if ((n == 0)); then retVal="$cmdLine"; else retVal=""; fi
+}
+
+#
+# Calculates the number of command line permutations for a group
+#
+# Parameters:
+#
+# $1        Array containing list of array names, each of which
+#           contains a group of command-line options
+#
+# Return Value:
+#
+# retVal    Generated command line string
+#
+function getNumCmdLinePermutations() {
+    local allArgGroups=("$@")
+    local numArgGroups="${#allArgGroups[@]}"
+    local groupNum count
+    for ((groupNum=0, count=1; groupNum<numArgGroups; groupNum++)); do
+        local -n groupVals="${allArgGroups[groupNum]}"
+        if [[ -z ${groupVals[@]} ]]; then
+            echo "Error: Command group \"${allArgGroups[groupNum]}\" not defined";
+            exit 1
+        fi
+        count=$((count * ${#groupVals[@]}))
+    done
+    retVal=$count
+
+}
+
+#
+# Executes fio
+#
+# Parameters:
+#
+# $1        Arguments
+#
+# Return Value:
+#
+# None - exits script on error
+#
+function execFio() {
+    args="$1"
+    "${fio_executable}" $args; exitCode=$?
+    if [ $exitCode -ne 0 ]; then
+        echo "*** FAILED - exit code is ${exitCode} ***";
+        echo "Full Args: $args"
+        exit $exitCode
+    fi
+}
+
+#
+# Executes all permutations for groups of command line options 
+#
+# Parameters:
+#
+# $1    Test description
+# $2    Arguments common to all fio invocations
+# $3    Array of command-line option groups. See getNextCmdLinePermutation()
+#       for format
+#
+# Return Value:
+#
+# None - exits script on error
+#
+function execGroupList() {
+
+    local permutationNumber countArgPermutations permutationArgs
+    local testDescription="$1"
+    local commonArgs="$2"
+    shift 2
+    local allArgGroups=("$@")
+
+    getNumCmdLinePermutations "${allArgGroups[@]}"; countArgPermutations=$retVal
+
+    echo
+    echo "**** Starting \"${testDescription}\" - ${countArgPermutations} permutations of arguments..."
+    echo
+
+    for ((permutationNumber=0; permutationNumber < countArgPermutations; permutationNumber++)); do
+        getNextCmdLinePermutation $permutationNumber "${allArgGroups[@]}"; permutationArgs=$retVal;
+        echo "** Executing permutation ${permutationNumber}, args: ${permutationArgs}"
+        execFio "$commonArgs $permutationArgs"
+    done
+
+    echo
+    echo "**** Finished \"${testDescription}\" - ${countArgPermutations} permutations of arguments..."
+    echo
+}
+
+function printAllPermutations() {
+    local allArgGroups=("$@")
+    local permutationNumber countArgPermutations permutationArgs
+    getNumCmdLinePermutations "${allArgGroups[@]}"; countArgPermutations=$retVal
+    for ((permutationNumber=0; permutationNumber < countArgPermutations; permutationNumber++)); do
+        getNextCmdLinePermutation $permutationNumber "${allArgGroups[@]}"; permutationArgs=$retVal;
+        echo "Permutation ${permutationNumber}: ${permutationArgs}"
+    done
+}
+
+#
+# execute tests
+#
+sampleTest
+