--- a
+++ b/scripts/validate_bio_format.sh
@@ -0,0 +1,46 @@
+#!/bin/bash
+
+# Check if the input directory exists
+if [ ! -d "$1" ]; then
+  echo "Error: Directory not found!"
+  exit 1
+fi
+
+# Loop through each .bio file in the input directory
+for file in "$1"/*.bio; do
+  # Check if the file exists
+  if [ ! -f "$file" ]; then
+    echo "Error: File not found!"
+    continue
+  fi
+
+  # Loop through each line in the file
+  prev_tag=""
+  while IFS=$'\t' read -r word tag; do
+    # Skip empty lines
+    if [[ "$word" =~ ^[[:space:]]*$ ]]; then
+      continue
+    fi
+
+    # Check if the second column contains a valid BIO tag
+    if [[ ! "$tag" =~ ^(B|I|O)-[A-Za-z_]+$ ]]; then
+      echo "Error: Invalid BIO tag on line: $word\t$tag in file $file"
+    fi
+
+    # Check if the tag sequence is valid
+    if [ "${tag:0:1}" == "I" ]; then
+      if [ "$prev_tag" == "" ]; then
+        echo "Error: Invalid tag sequence on line: $word\t$tag in file $file"
+      fi
+      if [ "${tag:2}" != "$prev_tag" ]; then
+        echo "Error: Invalid tag sequence on line: $word\t$tag in file $file"
+      fi
+    else
+      prev_tag="${tag:2}"
+    fi
+
+  done < "$file"
+
+  echo "$file contains valid BIO format."
+done
+