diff --git a/newdocs/src/changelog.md b/newdocs/src/changelog.md
index 4d74f90c..c325c251 100644
--- a/newdocs/src/changelog.md
+++ b/newdocs/src/changelog.md
@@ -8,6 +8,8 @@
 - [Issue 1289](https://github.com/jackdewinter/pymarkdown/issues/1289)
     - added documentation under Pre-Commit for how to write the configuration file
       for Pre-Commit if an alternate extension is needed for the files being scanned
+- [Issue 1318](https://github.com/jackdewinter/pymarkdown/issues/1318)
+    - ported perf_*.cmd scripts to perf_.sh scripts
 
 <!--- pyml disable-next-line no-duplicate-heading-->
 ### Fixed
diff --git a/perf_sample.sh b/perf_sample.sh
new file mode 100644
index 00000000..9092da62
--- /dev/null
+++ b/perf_sample.sh
@@ -0,0 +1,268 @@
+#!/usr/bin/env bash
+
+# Set the script mode to "strict".
+# http://redsymbol.net/articles/unofficial-bash-strict-mode/ without the fail fast.
+set -uo pipefail
+
+# Set up any project based local script variables.
+SCRIPT_NAME=$( basename -- "${BASH_SOURCE[0]}" )
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+TEMP_FILE=$(mktemp /tmp/$SCRIPT_NAME.XXXXXXXXX)
+TEMP_PERF_OUTPUT=$(mktemp /tmp/$SCRIPT_NAME.XXXXXXXXX)
+
+SCRIPT_TITLE="Profiling application constructed sample file"
+
+TEST_FILE_DIRECTORY="${SCRIPT_DIR}/build/ptest"
+
+# Perform any cleanup required by the script.
+cleanup_function(){
+
+    # If the temp file was used, get rid of it.
+    if [ -f "$TEMP_FILE" ]; then
+        rm "$TEMP_FILE"
+    fi
+    if [ -f "$TEMP_PERF_OUTPUT" ]; then
+        rm "$TEMP_PERF_OUTPUT"
+    fi
+
+    # Restore the current directory.
+    if [ "$DID_PUSHD" -eq 1 ]; then
+        popd > /dev/null 2>&1 || exit
+    fi
+}
+
+# Start the main part of the script off with a title.
+start_process() {
+    if [ "$VERBOSE_MODE" -ne 0 ]; then
+        echo "Saving current directory prior to execution."
+    fi
+    if ! pushd . >"$TEMP_FILE" 2>&1;  then
+        cat "$TEMP_FILE"
+        complete_process 1 "Script cannot save the current directory before proceeding."
+    fi
+    DID_PUSHD=1
+
+    trap cleanup_function EXIT
+
+    if [ "$VERBOSE_MODE" -ne 0 ]; then
+        echo "$SCRIPT_TITLE..."
+    fi
+}
+
+# Simple function to stop the process with information about why it stopped.
+complete_process() {
+    local SCRIPT_RETURN_CODE=$1
+    local COMPLETE_REASON=${2:-}
+
+    if [ -n "$COMPLETE_REASON" ] ; then
+        echo "$COMPLETE_REASON"
+    fi
+
+    if [ "$SCRIPT_RETURN_CODE" -ne 0 ]; then
+        echo "$SCRIPT_TITLE failed."
+    else
+        if [ "$VERBOSE_MODE" -ne 0 ]; then
+            echo "$SCRIPT_TITLE succeeded."
+        fi
+    fi
+
+    exit "$SCRIPT_RETURN_CODE"
+}
+
+# Give the user hints on how the script can be used.
+show_usage() {
+    local SCRIPT_NAME=$0
+
+    echo "Usage:"
+    echo "  $(basename "$SCRIPT_NAME") [flags]"
+    echo ""
+    echo "Summary:"
+    echo "  Executes a scan of a constructed document, capturing timing measurements."
+    echo ""
+    echo "Flags:"
+    echo "  -c,--csv-file {file}    Append results to file in CSV format."
+    echo "  -r,--repeats {num}      Number of repititions of the test document to merge together. Default 10."
+    echo "  -nr,--no-rules          Take measurements without processing any rules {Parser only.}"
+    echo "  -nc,--no-clear-cache    Do not clear the Python cache. Only recommended for repeated calls of this script."
+	echo "  -v,--view               View the measured performance metrics."
+    echo "  -x,--debug              Display debug information about the script as it executes."
+    echo "  -q,--quiet              Do not display detailed information during execution."
+    echo "  -h,--help               Display this help text."
+    echo ""
+    exit 1
+}
+
+# Parse the command line.
+parse_command_line() {
+
+    NO_RULES_MODE=0
+    NO_CLEAR_MODE=0
+    DEBUG_MODE=0
+    VIEW_MODE=0
+    VERBOSE_MODE=1
+    NUM_REPEATS=10
+    CSV_OUTPUT=
+    PARAMS=()
+    while (( "$#" )); do
+    case "$1" in
+        -c|--csv-file)
+            if [ -z "${2:-}" ] ; then
+                echo "Error: Argument $1 must be followed by the file to write to." >&2
+                show_usage
+            fi
+            CSV_OUTPUT=$2
+            shift
+            shift
+        ;;
+        -r|--repeats)
+            if [ -z "${2:-}" ] ; then
+                echo "Error: Argument $1 must be followed by the number of repititions to use." >&2
+                show_usage
+            fi
+            NUM_REPEATS=$2
+            if ! [[ $NUM_REPEATS =~ ^[1-9][0-9]*$ ]]; then
+                echo "${NUM} is not an integer"
+                echo "Error: Argument $1 is not followed by a valid number: ${NUM_REPEATS}" >&2
+                show_usage
+            fi
+            shift
+            shift
+        ;;
+        -v|--view)
+            VIEW_MODE=1
+            shift
+        ;;
+        -nr|--no-rules)
+            NO_RULES_MODE=1
+            shift
+        ;;
+        -nc|--no-clear-cache)
+            NO_CLEAR_MODE=1
+            shift
+        ;;
+        -x|--debug)
+            DEBUG_MODE=1
+            shift
+        ;;
+        -q|--quiet)
+            VERBOSE_MODE=0
+            shift
+        ;;
+        -h|--help)
+            show_usage
+        ;;
+        -*) # unsupported flags
+            echo "Error: Unsupported flag $1" >&2
+            show_usage
+        ;;
+        *) # preserve positional arguments
+            PARAMS+=("$1")
+            shift
+        ;;
+    esac
+    done
+
+    if [[ $DEBUG_MODE -ne 0 ]] ; then
+        set -x
+    fi
+}
+
+# Get the executable path for the current bash shell.
+BASH_EXEC=${BASH}
+if [[ "${MSYSTEM:-}" =~ ^MINGW(64|32)$ ]] ; then
+    WINPID=$(ps -p $$ | awk 'NR ==2{print $4}')
+    if [[ -z "$WINPID" ]] ; then
+        echo "Cannot get Windows PID for Bash shell."
+        exit 1
+    fi
+    BASH_EXEC="$(wmic process where "ProcessID=$WINPID" get ExecutablePath | sed -n 2p | sed 's/\\/\\\\/g')"
+fi
+
+# Parse any command line values.
+parse_command_line "$@"
+
+# Clean entrance into the script.
+start_process
+
+SINGLE_TEST_SOURCE_FILE=test/resources/performance/sample.md
+SINGLE_TEST_DESTINATION_FILE="${TEST_FILE_DIRECTORY}"/test.md
+
+# Make sure we have a directory to create the test files for profiling in, and ensure
+# that it is empty before we start processing.
+if ! mkdir -p "${TEST_FILE_DIRECTORY}" > "${TEMP_FILE}" 2>&1 ; then
+    cat "${TEMP_FILE}"
+    complete_process 1 "{Creating test report directory failed.}"
+fi
+rm -r "${TEST_FILE_DIRECTORY}"/* > /dev/null 2>&1
+
+# Create a composite document with NUM_REPEATS copies of the source document. 
+echo "Creating single document with ${NUM_REPEATS} copies of '${SINGLE_TEST_SOURCE_FILE}'."
+for i in $(seq ${NUM_REPEATS}); do
+    cat "${SINGLE_TEST_SOURCE_FILE}" >> "${SINGLE_TEST_DESTINATION_FILE}"
+done
+
+# Remove any __pycache__ related files unless asked not to.
+if [[ $NO_CLEAR_MODE -eq 0 ]] ; then
+    echo "Resetting Python caches..."
+    PYTHONPYCACHEPREFIX="${SCRIPT_DIR}"/.pycache
+    rm -r "${PYTHONPYCACHEPREFIX}" > /dev/null 2>&1
+    if ! python3 -Bc "import pathlib; [p.unlink() for p in pathlib.Path('.').rglob('*.py[co]')]" > "${TEMP_FILE}" 2>&1 ; then
+        cat "${TEMP_FILE}"
+        complete_process 1 "{Creating test report directory failed.}"
+    fi
+    if ! python3 -Bc "import pathlib; [p.rmdir() for p in pathlib.Path('.').rglob('__pycache__')]" > "${TEMP_FILE}" 2>&1 ; then
+        cat "${TEMP_FILE}"
+        complete_process 1 "{Creating test report directory failed.}"
+    fi
+
+    # ... and then take the steps to properly create any needed caching by running through a single pass once.
+    if ! python -m compileall pymarkdown > "${TEMP_FILE}" 2>&1 ; then
+        cat "${TEMP_FILE}"
+        complete_process 1 "{Pre-compilation of project failed.}"
+    fi
+    if ! python -OO -c "import subprocess; subprocess.run(['${BASH_EXEC}','run.sh','scan','$SINGLE_TEST_SOURCE_FILE'])" > "${TEMP_FILE}" 2>&1 ; then
+        cat "${TEMP_FILE}"
+        complete_process 1 "{Pre-measurement pass of project failed.}"
+    fi
+else
+    echo "Resetting Python caches skipped by request."
+fi
+
+NO_RULES_ARGS=
+if [[ $NO_RULES_MODE -ne 0 ]] ; then
+    NO_RULES_ARGS="'--disable-rules','*',"
+fi
+
+echo "Scanning created document..."
+python -OO -c "import subprocess,os,time; \
+    my_env = os.environ.copy();\
+    my_env['PYMARKDOWNLINT__PERFRUN'] = '1';\
+    start_time = time.time();\
+    subprocess.run(['${BASH_EXEC}','run.sh',${NO_RULES_ARGS}'scan','$SINGLE_TEST_DESTINATION_FILE'], env=my_env);\
+    value = time.time() - start_time;\
+    print(f'{value:.3f}');\
+    " > "${TEMP_PERF_OUTPUT}" 2>&1
+echo "Document scanning completed."
+
+EXECUTION_TIME=$( tail -n 1 "${TEMP_PERF_OUTPUT}" )
+LINES_IN_PROF_OUTPUT=$(sed -n '$=' "${TEMP_PERF_OUTPUT}" )
+
+if [[ -n "$CSV_OUTPUT" ]] ; then
+    echo "${NUM_REPEATS},${LINES_IN_PROF_OUTPUT},$EXECUTION_TIME" >> "$CSV_OUTPUT"
+else
+    echo ""
+    echo "Repeats in File: ${NUM_REPEATS}"
+    echo "Lines in output: $LINES_IN_PROF_OUTPUT"
+    echo "Execution time:  $EXECUTION_TIME"
+    echo ""
+fi
+
+
+# If in view mode, use SnakeViz to visualize.
+if [[ $VIEW_MODE -ne 0 ]] ; then
+    echo ""
+    echo "Starting SnakeViz to view performance profile..."
+    pipenv run snakeviz p0.prof
+fi
+
+complete_process 0
diff --git a/perf_series.sh b/perf_series.sh
new file mode 100644
index 00000000..dc9dd241
--- /dev/null
+++ b/perf_series.sh
@@ -0,0 +1,283 @@
+#!/usr/bin/env bash
+
+# Set the script mode to "strict".
+# http://redsymbol.net/articles/unofficial-bash-strict-mode/ without the fail fast.
+set -uo pipefail
+
+# Set up any project based local script variables.
+SCRIPT_NAME=$( basename -- "${BASH_SOURCE[0]}" )
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+TEMP_FILE=$(mktemp /tmp/$SCRIPT_NAME.XXXXXXXXX)
+
+SCRIPT_TITLE="Batch profiling of application"
+
+TEST_FILE_DIRECTORY="${SCRIPT_DIR}/build/ptest"
+
+# Perform any cleanup required by the script.
+cleanup_function(){
+
+    # If the temp file was used, get rid of it.
+    if [ -f "$TEMP_FILE" ]; then
+        rm "$TEMP_FILE"
+    fi
+
+    # Restore the current directory.
+    if [ "$DID_PUSHD" -eq 1 ]; then
+        popd > /dev/null 2>&1 || exit
+    fi
+}
+
+# Start the main part of the script off with a title.
+start_process() {
+    if [ "$VERBOSE_MODE" -ne 0 ]; then
+        echo "Saving current directory prior to execution."
+    fi
+    if ! pushd . >"$TEMP_FILE" 2>&1;  then
+        cat "$TEMP_FILE"
+        complete_process 1 "Script cannot save the current directory before proceeding."
+    fi
+    DID_PUSHD=1
+
+    trap cleanup_function EXIT
+
+    if [ "$VERBOSE_MODE" -ne 0 ]; then
+        echo "$SCRIPT_TITLE..."
+    fi
+}
+
+# Simple function to stop the process with information about why it stopped.
+complete_process() {
+    local SCRIPT_RETURN_CODE=$1
+    local COMPLETE_REASON=${2:-}
+
+    if [ -n "$COMPLETE_REASON" ] ; then
+        echo "$COMPLETE_REASON"
+    fi
+
+    if [ "$SCRIPT_RETURN_CODE" -ne 0 ]; then
+        echo "$SCRIPT_TITLE failed."
+    else
+        if [ "$VERBOSE_MODE" -ne 0 ]; then
+            echo "$SCRIPT_TITLE succeeded."
+        fi
+    fi
+
+    exit "$SCRIPT_RETURN_CODE"
+}
+
+# Give the user hints on how the script can be used.
+show_usage() {
+    local SCRIPT_NAME=$0
+
+    echo "Usage:"
+    echo "  $(basename "$SCRIPT_NAME") [flags]"
+    echo ""
+    echo "Summary:"
+    echo "  Executes a scan of a constructed document, capturing timing measurements."
+    echo ""
+    echo "Flags:"
+    echo "  -s,--start              Repeat count to start at."
+    echo "  -e,--end                Repeat count to end at."
+    echo "  -l,--list               List of comma separated repeat counts to use instead of -s and -e."
+    echo "  -c,--count              Count of times for each series of repeats."
+    echo "  -o,--only-first         Only clear the Python cache at the start of the series."
+    echo "  -t,--tag                Tag to associate with this series of tests."
+    echo "  -nr,--no-rules          Take measurements without processing any rules {Parser only.}"
+    echo "  -x,--debug              Display debug information about the script as it executes."
+    echo "  -q,--quiet              Do not display detailed information during execution."
+    echo "  -h,--help               Display this help text."
+    echo ""
+    echo "Example:"
+    echo "  To run a series of tests, from 10 to 15 repeats:"
+    echo "    $(basename "$SCRIPT_NAME") -s 10 -e 15"
+    echo "  To run a series of tests, from 10 to 15 repeats, twice:"
+    echo "    $(basename "$SCRIPT_NAME") -s 10 -e 15 --count 2"
+    echo "  To run a series of tests, only 10 and 15 repeats, twice:"
+    echo "    $(basename "$SCRIPT_NAME") -l 10_15 --count 2"
+    exit 1
+}
+
+# Parse the command line.
+parse_command_line() {
+
+    NO_RULES_MODE=0
+    DEBUG_MODE=0
+    ONLY_FIRST=0
+    VERBOSE_MODE=1
+    TEST_SERIES_TAG=
+    NUM_COUNT=1
+    NUM_MINIMUM=1
+    NUM_MAXIMUM=2
+    ALTERNATE_REPEAT_LIST=
+    PARAMS=()
+    while (( "$#" )); do
+    case "$1" in
+        -s|--start)
+            if [ -z "${2:-}" ] ; then
+                echo "Error: Argument $1 must be followed by the number of repeats to start at." >&2
+                show_usage
+            fi
+            NUM_MINIMUM=$2
+            if ! [[ $NUM_MINIMUM =~ ^[1-9][0-9]*$ ]]; then
+                echo "${NUM_MINIMUM} is not an integer"
+                echo "Error: Argument $1 is not followed by a valid number: ${NUM_MINIMUM}" >&2
+                show_usage
+            fi
+            shift
+            shift
+        ;;
+        -e|--end)
+            if [ -z "${2:-}" ] ; then
+                echo "Error: Argument $1 must be followed by the number of repeats to start at." >&2
+                show_usage
+            fi
+            NUM_MAXIMUM=$2
+            if ! [[ $NUM_MAXIMUM =~ ^[1-9][0-9]*$ ]]; then
+                echo "${NUM_MAXIMUM} is not an integer"
+                echo "Error: Argument $1 is not followed by a valid number: ${NUM_MAXIMUM}" >&2
+                show_usage
+            fi
+            shift
+            shift
+        ;;
+        -c|--count)
+            if [ -z "${2:-}" ] ; then
+                echo "Error: Argument $1 must be followed by the number of series to execute." >&2
+                show_usage
+            fi
+            NUM_COUNT=$2
+            if ! [[ $NUM_COUNT =~ ^[1-9][0-9]*$ ]]; then
+                echo "${NUM_COUNT} is not an integer"
+                echo "Error: Argument $1 is not followed by a valid number: ${NUM_COUNT}" >&2
+                show_usage
+            fi
+            shift
+            shift
+        ;;
+        -l|--list)
+            if [ -z "${2:-}" ] ; then
+                echo "Error: Argument $1 must be followed by a list of repeat counts." >&2
+                show_usage
+            fi
+            ALTERNATE_REPEAT_LIST=$2
+            shift
+            shift
+        ;;
+        -t|--tag)
+            if [ -z "${2:-}" ] ; then
+                echo "Error: Argument $1 must be followed by the tag to use." >&2
+                show_usage
+            fi
+            TEST_SERIES_TAG=$2
+            shift
+            shift
+        ;;
+        -o|--only-first)
+            ONLY_FIRST=1
+            shift
+        ;;
+        -nr|--no-rules)
+            NO_RULES_MODE=1
+            shift
+        ;;
+        -x|--debug)
+            DEBUG_MODE=1
+            shift
+        ;;
+        -q|--quiet)
+            VERBOSE_MODE=0
+            shift
+        ;;
+        -h|--help)
+            show_usage
+        ;;
+        -*) # unsupported flags
+            echo "Error: Unsupported flag $1" >&2
+            show_usage
+        ;;
+        *) # preserve positional arguments
+            PARAMS+=("$1")
+            shift
+        ;;
+    esac
+    done
+
+    if [[ $DEBUG_MODE -ne 0 ]] ; then
+        set -x
+    fi
+}
+
+# Parse any command line values.
+parse_command_line "$@"
+
+# Clean entrance into the script.
+start_process
+
+# Determine whether the CSV file will be written to and make sure that the directory exists.
+if [[ -n "$TEST_SERIES_TAG" ]] ; then
+    DEST_FILE="build/series-${TEST_SERIES_TAG}.csv"
+else
+    DEST_FILE=build/series.csv
+fi
+
+if ! mkdir -p $(dirname "${DEST_FILE}") > "${TEMP_FILE}" 2>&1 ; then
+    cat "${TEMP_FILE}"
+    complete_process 1 "{Creating test report directory failed.}"
+fi
+rm "${DEST_FILE}" > /dev/null 2>&1
+
+# Set up so we can pass the '--no-rules' argument to the perf_sample.sh script.
+PERF_SAMPLE_ARGS=
+if [[ $NO_RULES_MODE -ne 0 ]] ; then
+    PERF_SAMPLE_ARGS="--no-rules "
+fi
+
+# If asked to only clear the python cache for the first sample, do so before
+# any samples are taken, and make sure any following calls do not clear the cache.
+if [[ $ONLY_FIRST -ne 0 ]] ; then
+    if ! $SCRIPT_DIR/perf_sample.sh -nr --repeats 1 > ${TEMP_FILE} 2>&1 ; then
+        cat "${TEMP_FILE}"
+        complete_process 1 "Executing warmup run before series failed."
+    fi
+    PERF_SAMPLE_ARGS="$PERF_SAMPLE_ARGS --no-clear-cache"
+fi
+
+# Repeat the samples NUM_COUNT times. 
+for i in $(seq ${NUM_COUNT}); do
+    echo "Times Through Series: $i"
+
+    # If a comma separated repeat list, cycle through it...
+    if [[ -n $ALTERNATE_REPEAT_LIST ]] ; then
+
+        IFS=',' read -r -a repeat_array <<< "$ALTERNATE_REPEAT_LIST"
+        for REPEAT_COUNT in "${repeat_array[@]}"; do
+
+            echo "  Repeat Count: $REPEAT_COUNT"
+            if ! $SCRIPT_DIR/perf_sample.sh ${PERF_SAMPLE_ARGS} --repeats $REPEAT_COUNT -c ${DEST_FILE}  > ${TEMP_FILE} 2>&1 ; then
+                cat "${TEMP_FILE}"
+                complete_process 1 "Executing profile run for $REPEAT_COUNT repeats failed."
+            fi
+
+        done    
+
+    # ... otherwise, do a simple loop.
+    else
+        REPEAT_COUNT=$NUM_MINIMUM
+        while [ $REPEAT_COUNT -le $NUM_MAXIMUM ] ; do
+
+            echo "  Repeat Count: $REPEAT_COUNT"
+            if ! $SCRIPT_DIR/perf_sample.sh ${PERF_SAMPLE_ARGS} --repeats $REPEAT_COUNT -c ${DEST_FILE}  > ${TEMP_FILE} 2>&1 ; then
+                cat "${TEMP_FILE}"
+                complete_process 1 "Executing profile run for $REPEAT_COUNT repeats failed."
+            fi
+
+            ((REPEAT_COUNT++))
+        done
+    fi
+done
+
+
+echo ""
+echo "CSV file '${DEST_FILE}' written with sample timings."
+
+complete_process 0