diff --git a/compliance/nvidia/TEST01/run_verification.py b/compliance/nvidia/TEST01/run_verification.py
index 05e0f70dd9..921e46c70b 100644
--- a/compliance/nvidia/TEST01/run_verification.py
+++ b/compliance/nvidia/TEST01/run_verification.py
@@ -76,51 +76,68 @@ def main():
     output_dir = os.path.join(args.output_dir, "TEST01")
     unixmode = ""
     if args.unixmode:
-        unixmode = " --unixmode"
-        for binary in ["wc", "md5sum", "grep", "awk", "sed", "head", "tail"]:
+        if os.name != "posix":
+            print(
+                "Warning: --unixmode not supported on this OS. Using Python fallback...")
+            unixmode = ""
+        else:
+            unixmode = " --unixmode"
             missing_binary = False
-            if shutil.which(binary) is None:
-                print(
-                    "Error: This script requires the {:} commandline utility".format(
-                        binary
+            for binary in ["wc", "md5sum", "grep",
+                           "awk", "sed", "head", "tail"]:
+                if shutil.which(binary) is None:
+                    print(
+                        "Error: This script requires the {:} commandline utility".format(
+                            binary
+                        )
                     )
-                )
-                missing_binary = True
-        if missing_binary:
-            exit()
+                    missing_binary = True
+            if missing_binary:
+                exit()
 
     dtype = args.dtype
 
     verify_accuracy_binary = os.path.join(
         os.path.dirname(__file__), "verify_accuracy.py"
     )
+
+    unixmode_str = unixmode if unixmode == "" else unixmode + " "
+
     # run verify accuracy
     verify_accuracy_command = (
-        "python3 "
+        sys.executable + " "
         + verify_accuracy_binary
         + " --dtype "
         + args.dtype
-        + unixmode
+        + unixmode_str
         + " -r "
-        + results_dir
-        + "/accuracy/mlperf_log_accuracy.json"
+        + os.path.join(results_dir, "accuracy", "mlperf_log_accuracy.json")
         + " -t "
-        + compliance_dir
-        + "/mlperf_log_accuracy.json | tee verify_accuracy.txt"
+        + os.path.join(compliance_dir, "mlperf_log_accuracy.json")
     )
     try:
-        os.system(verify_accuracy_command)
+        with open("verify_accuracy.txt", "w") as f:
+            process = subprocess.Popen(
+                verify_accuracy_command,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.STDOUT,
+                shell=True,
+                text=True
+            )
+            # Write output to both console and file
+            for line in process.stdout:
+                print(line, end="")
+                f.write(line)
+            process.wait()
     except Exception:
         print(
             "Exception occurred trying to execute:\n  " +
             verify_accuracy_command)
     # check if verify accuracy script passes
 
-    accuracy_pass_command = "grep PASS verify_accuracy.txt"
     try:
-        accuracy_pass = "TEST PASS" in subprocess.check_output(
-            accuracy_pass_command, shell=True
-        ).decode("utf-8")
+        with open("verify_accuracy.txt", "r") as file:
+            accuracy_pass = "TEST PASS" in file.read()
     except Exception:
         accuracy_pass = False
 
@@ -129,28 +146,38 @@ def main():
         os.path.dirname(__file__), "verify_performance.py"
     )
     verify_performance_command = (
-        "python3 "
+        sys.executable + " "
         + verify_performance_binary
-        + " -r "
-        + results_dir
-        + "/performance/run_1/mlperf_log_detail.txt"
-        + " -t "
-        + compliance_dir
-        + "/mlperf_log_detail.txt | tee verify_performance.txt"
+        + " -r"
+        + os.path.join(results_dir, "performance",
+                       "run_1", "mlperf_log_detail.txt")
+        + " -t"
+        + os.path.join(compliance_dir, "mlperf_log_detail.txt")
     )
+
     try:
-        os.system(verify_performance_command)
+        with open("verify_performance.txt", "w") as f:
+            process = subprocess.Popen(
+                verify_performance_command,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.STDOUT,
+                text=True,
+                shell=True,
+            )
+            # Write output to both console and file
+            for line in process.stdout:
+                print(line, end="")
+                f.write(line)
+            process.wait()
     except Exception:
         print(
             "Exception occurred trying to execute:\n  " +
             verify_performance_command)
 
     # check if verify performance script passes
-    performance_pass_command = "grep PASS verify_performance.txt"
     try:
-        performance_pass = "TEST PASS" in subprocess.check_output(
-            performance_pass_command, shell=True
-        ).decode("utf-8")
+        with open("verify_performance.txt", "r") as file:
+            performance_pass = "TEST PASS" in file.read()
     except Exception:
         performance_pass = False
 
diff --git a/compliance/nvidia/TEST01/verify_accuracy.py b/compliance/nvidia/TEST01/verify_accuracy.py
index 7f8a750a35..3ba15f0996 100644
--- a/compliance/nvidia/TEST01/verify_accuracy.py
+++ b/compliance/nvidia/TEST01/verify_accuracy.py
@@ -20,6 +20,8 @@
 import subprocess
 import sys
 import shutil
+import hashlib
+import re
 
 sys.path.append(os.getcwd())
 
@@ -161,15 +163,11 @@ def main():
         print("Error: This script requires Python v3.3 or later")
         exit()
 
-    get_perf_lines_cmd = "wc -l " + perf_log + "| awk '{print $1}'"
-    num_perf_lines = int(
-        subprocess.check_output(get_perf_lines_cmd, shell=True).decode("utf-8")
-    )
+    with open(perf_log, "r") as file:
+        num_perf_lines = sum(1 for _ in file)
 
-    get_acc_lines_cmd = "wc -l " + acc_log + "| awk '{print $1}'"
-    num_acc_lines = int(
-        subprocess.check_output(get_acc_lines_cmd, shell=True).decode("utf-8")
-    )
+    with open(acc_log, "r") as file:
+        num_acc_lines = sum(1 for _ in file)
 
     num_acc_log_entries = num_acc_lines - 2
     num_perf_log_entries = num_perf_lines - 2
@@ -189,42 +187,38 @@ def main():
             continue
 
         # calculate md5sum of line in perf mode accuracy_log
-        perf_md5sum_cmd = (
-            "head -n "
-            + str(perf_line + 1)
-            + " "
-            + perf_log
-            + "| tail -n 1| sed -r 's/,//g' | sed -r 's/\"seq_id\" : \\S+//g' | md5sum"
-        )
-        # print(perf_md5sum_cmd)
-        perf_md5sum = subprocess.check_output(perf_md5sum_cmd, shell=True).decode(
-            "utf-8"
-        )
-
-        # get qsl idx
-        get_qsl_idx_cmd = (
-            "head -n "
-            + str(perf_line + 1)
-            + " "
-            + perf_log
-            + "| tail -n 1| awk -F\": |,\" '{print $4}'"
-        )
-        qsl_idx = (
-            subprocess.check_output(get_qsl_idx_cmd, shell=True)
-            .decode("utf-8")
-            .rstrip()
-        )
+        # read the specific line
+        with open(perf_log, "r") as f:
+            for i, line in enumerate(f):
+                if i == perf_line:
+                    line_content = line.strip()
+                    break
+
+        # remove commas and remove 'seq_id' key-value
+        clean_line = line_content.replace(",", "")
+        clean_line = re.sub(r'"seq_id"\s*:\s*\S+', '', clean_line)
+
+        # calculate md5sum
+        perf_md5sum = hashlib.md5(clean_line.encode("utf-8")).hexdigest()
+
+        # extract qsl idx
+        fields = re.split(r": |,", line_content)
+        qsl_idx = fields[3].strip()
 
         # calculate md5sum of line in acc mode accuracy_log
-        acc_md5sum_cmd = (
-            'grep "qsl_idx\\" : '
-            + qsl_idx
-            + '," '
-            + acc_log
-            + "| sed -r 's/,//g' | sed -r 's/\"seq_id\" : \\S+//g' | md5sum"
-        )
-        acc_md5sum = subprocess.check_output(
-            acc_md5sum_cmd, shell=True).decode("utf-8")
+        acc_matches = []
+        with open(acc_log, "r") as f:
+            for line in f:
+                if f'"qsl_idx" : {qsl_idx},' in line:
+                    acc_matches.append(line.strip())
+
+        # join all matching lines together
+        acc_line = "\n".join(acc_matches)
+
+        acc_line = acc_line.replace(",", "")
+        acc_line = re.sub(r'"seq_id"\s*:\s*\S+', '', acc_line)
+
+        acc_md5sum = hashlib.md5(acc_line.encode("utf-8")).hexdigest()
 
         if perf_md5sum != acc_md5sum:
             num_perf_log_data_mismatch += 1
diff --git a/compliance/nvidia/TEST04/run_verification.py b/compliance/nvidia/TEST04/run_verification.py
index 647f71f82a..4584e59c46 100644
--- a/compliance/nvidia/TEST04/run_verification.py
+++ b/compliance/nvidia/TEST04/run_verification.py
@@ -58,28 +58,38 @@ def main():
         os.path.dirname(__file__), "verify_performance.py"
     )
     verify_performance_command = (
-        "python3 "
+        sys.executable + " "
         + verify_performance_binary
-        + " -r "
-        + results_dir
-        + "/performance/run_1/mlperf_log_summary.txt"
-        + " -t "
-        + compliance_dir
-        + "/mlperf_log_summary.txt | tee verify_performance.txt"
+        + " -r"
+        + os.path.join(results_dir, "performance",
+                       "run_1", "mlperf_log_summary.txt")
+        + " -t"
+        + os.path.join(compliance_dir, "mlperf_log_summary.txt")
     )
+
     try:
-        os.system(verify_performance_command)
+        with open("verify_performance.txt", "w") as f:
+            process = subprocess.Popen(
+                verify_performance_command,
+                stdout=subprocess.PIPE,  # capture output
+                stderr=subprocess.STDOUT,
+                text=True,  # decode output as text
+                shell=True,
+            )
+            # Write output to both console and file
+            for line in process.stdout:
+                print(line, end="")  # console
+                f.write(line)        # file
+            process.wait()
     except Exception:
         print(
             "Exception occurred trying to execute:\n  " +
             verify_performance_command)
 
     # check if verify performance script passes
-    performance_pass_command = "grep PASS verify_performance.txt"
     try:
-        performance_pass = "TEST PASS" in subprocess.check_output(
-            performance_pass_command, shell=True
-        ).decode("utf-8")
+        with open("verify_performance.txt", "r") as file:
+            performance_pass = "TEST PASS" in file.read()
     except Exception:
         performance_pass = False