diff --git a/filename_formatter.sh b/filename_formatter.sh
old mode 100755
new mode 100644
diff --git a/formatter/action.yml b/formatter/action.yml
index cb7cbd5..cc232b2 100644
--- a/formatter/action.yml
+++ b/formatter/action.yml
@@ -25,7 +25,7 @@ runs:
     - name: Running the formatter
       shell: bash
       run: |
-        ./filename_formatter.sh ${{ inputs.working-directory }} ${{ inputs.filetypes }} ${{ inputs.ignore-files }}
+        filename_formatter.sh ${{ inputs.working-directory }} ${{ inputs.filetypes }} ${{ inputs.ignore-files }}
     - name: Committing changes
       shell: bash
       run: |
diff --git a/formatter/filename_formatter.sh b/formatter/filename_formatter.sh
new file mode 100755
index 0000000..cc9bfed
--- /dev/null
+++ b/formatter/filename_formatter.sh
@@ -0,0 +1,60 @@
+#!/bin/bash
+
+echo -e "Arguments:
+[0] - Used by Bash (script filename)
+[1] - Base directory
+[2] - Filename type (maximum two values)
+[3] - Ignored files or folders (optional; use "\""./<directory_name>"\"")
+"
+
+# Separate $2 value (filename types) if it has a comma
+if [[ "$2" == *","* ]];
+then
+    string="$2"
+
+    str_value=${string#*,}
+    str_value2=${string%%,*}
+else
+    str_value="$2"
+    str_value2="$2"
+fi
+
+# Do not run script if there are no given arguments.
+if [[ "$1" == "" ]] || [[ "$2" == "" ]];
+then
+    echo "No arguments given. Please specify minimum two arguments."
+    exit 1
+fi
+
+echo "Changed files:"
+
+IFS=$'\n'; set -f
+for fname in $(find $1 -type f -name "*$str_value2" -or -name "*$str_value")
+do
+    ignored_files="$(echo "$3" | tr "," "\n")"
+
+    str="${fname}"
+    value=${str%/*} # If the base directory is `.`, check in all directories for the ignored filenames
+
+    for files in $ignored_files
+    do
+        if [ "${fname}" == "$value/$files" ] || [ "$value" == "$files" ];
+        then
+            continue 2
+        fi
+    done
+
+    #echo ${fname}
+    new_fname=$(echo "${fname}" | tr ' ' '_')
+    #echo "      ${new_fname}"
+    new_fname=$(echo "${new_fname}" | tr '[:upper:]' '[:lower:]')
+    #echo "      ${new_fname}"
+    new_fname=$(echo "${new_fname}" | tr '-' '_')
+    #echo "      ${new_fname}"
+    if [ "${fname}" != "${new_fname}" ]
+    then
+        echo "      ${fname} --> ${new_fname}"
+        git "mv" "${fname}" "${new_fname}" # Requires you to be in version control
+    fi
+done
+unset IFS; set +f