diff --git a/egs2/TEMPLATE/asr1/pyscripts/utils/rotate_logfile.py b/egs2/TEMPLATE/asr1/pyscripts/utils/rotate_logfile.py
new file mode 100755
index 00000000000..e30c7a1e682
--- /dev/null
+++ b/egs2/TEMPLATE/asr1/pyscripts/utils/rotate_logfile.py
@@ -0,0 +1,59 @@
+#!/usr/bin/env python
+
+# Copyright 2022 Chaitanya Narisetty
+#  Apache 2.0  (http://www.apache.org/licenses/LICENSE-2.0)
+
+"""Rotate log-file."""
+
+import argparse
+from pathlib import Path
+import shutil
+
+
+def rotate(path, max_num_log_files=1000):
+    """Rotate a log-file while retaining past `max_num_log_files` files.
+    Examples:
+        /some/path/
+        ├──logfile.txt
+        ├──logfile.1.txt
+        ├──logfile.2.txt
+        >>> rotate('/some/path/logfile.txt')
+        /some/path/
+        ├──logfile.1.txt
+        ├──logfile.2.txt
+        ├──logfile.3.txt
+    """
+    for i in range(max_num_log_files - 1, -1, -1):
+        if i == 0:
+            p = Path(path)
+            pn = p.parent / (p.stem + ".1" + p.suffix)
+        else:
+            _p = Path(path)
+            p = _p.parent / (_p.stem + f".{i}" + _p.suffix)
+            pn = _p.parent / (_p.stem + f".{i + 1}" + _p.suffix)
+
+        if p.exists():
+            if i == max_num_log_files - 1:
+                p.unlink()
+            else:
+                shutil.move(p, pn)
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "log_filepath", type=str, help="Path to log-file to be rotated."
+    )
+    parser.add_argument(
+        "--max-num-log-files",
+        type=int,
+        help="Maximum number of log-files to be kept.",
+        default=1000,
+    )
+    args = parser.parse_args()
+
+    rotate(args.log_filepath, args.max_num_log_files)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/egs2/TEMPLATE/st1/st.sh b/egs2/TEMPLATE/st1/st.sh
index a43e6aef9a9..bc0f57e4173 100755
--- a/egs2/TEMPLATE/st1/st.sh
+++ b/egs2/TEMPLATE/st1/st.sh
@@ -1472,12 +1472,18 @@ if ! "${skip_eval}"; then
             detokenizer.perl -l ${tgt_lang} -q < "${_scoredir}/ref.trn" > "${_scoredir}/ref.trn.detok"
             detokenizer.perl -l ${tgt_lang} -q < "${_scoredir}/hyp.trn" > "${_scoredir}/hyp.trn.detok"
 
+            # rotate result files
+            if [ ${tgt_case} = "tc" ]; then
+                pyscripts/utils/rotate_logfile.py ${_scoredir}/result.tc.txt
+            fi
+            pyscripts/utils/rotate_logfile.py ${_scoredir}/result.lc.txt
+
             if [ ${tgt_case} = "tc" ]; then
                 echo "Case sensitive BLEU result (single-reference)" > ${_scoredir}/result.tc.txt
                 sacrebleu "${_scoredir}/ref.trn.detok" \
                           -i "${_scoredir}/hyp.trn.detok" \
                           -m bleu chrf ter \
-                          > ${_scoredir}/result.tc.txt
+                          >> ${_scoredir}/result.tc.txt
                 
                 log "Write a case-sensitive BLEU (single-reference) result in ${_scoredir}/result.tc.txt"
             fi
@@ -1489,7 +1495,7 @@ if ! "${skip_eval}"; then
             sacrebleu -lc "${_scoredir}/ref.trn.detok.lc.rm" \
                       -i "${_scoredir}/hyp.trn.detok.lc.rm" \
                       -m bleu chrf ter \
-                      > ${_scoredir}/result.lc.txt
+                      >> ${_scoredir}/result.lc.txt
             log "Write a case-insensitve BLEU (single-reference) result in ${_scoredir}/result.lc.txt"
 
             # process multi-references cases
@@ -1520,17 +1526,17 @@ if ! "${skip_eval}"; then
                 done
 
                 if [ ${tgt_case} = "tc" ]; then
-                    echo "Case sensitive BLEU result (multi-references)" > ${_scoredir}/result.tc.txt
+                    echo "Case sensitive BLEU result (multi-references)" >> ${_scoredir}/result.tc.txt
                     sacrebleu ${case_sensitive_refs} \
                         -i ${_scoredir}/hyp.trn.detok.lc.rm -m bleu chrf ter \
-                        > ${_scoredir}/result.tc.txt
+                        >> ${_scoredir}/result.tc.txt
                     log "Write a case-sensitve BLEU (multi-reference) result in ${_scoredir}/result.tc.txt"
                 fi
 
-                echo "Case insensitive BLEU result (multi-references)" > ${_scoredir}/result.lc.txt
+                echo "Case insensitive BLEU result (multi-references)" >> ${_scoredir}/result.lc.txt
                 sacrebleu -lc ${case_insensitive_refs} \
                     -i ${_scoredir}/hyp.trn.detok.lc.rm -m bleu chrf ter \
-                    > ${_scoredir}/result.lc.txt
+                    >> ${_scoredir}/result.lc.txt
                 log "Write a case-insensitve BLEU (multi-reference) result in ${_scoredir}/result.lc.txt"
             fi
         done