diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractRubyCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractRubyCodegen.java
index c977c7cb899..2a57b927457 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractRubyCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractRubyCodegen.java
@@ -17,6 +17,8 @@
 
 package org.openapitools.codegen.languages;
 
+import org.apache.commons.io.FilenameUtils;
+import org.apache.commons.lang3.StringUtils;
 import io.swagger.v3.oas.models.media.ArraySchema;
 import io.swagger.v3.oas.models.media.Schema;
 import org.openapitools.codegen.CodegenConfig;
@@ -25,6 +27,7 @@ import org.openapitools.codegen.utils.ModelUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.File;
 import java.util.Arrays;
 import java.util.Locale;
 
@@ -77,6 +80,15 @@ abstract class AbstractRubyCodegen extends DefaultCodegen implements CodegenConf
         typeMapping.put("UUID", "String");
     }
 
+    @Override
+    public void processOpts() {
+        super.processOpts();
+
+        if (StringUtils.isEmpty(System.getenv("RUBY_POST_PROCESS_FILE"))) {
+            LOGGER.info("Hint: Environment variable 'RUBY_POST_PROCESS_FILE' (optional) not defined. E.g. to format the source code, please try 'export RUBY_POST_PROCESS_FILE=/usr/local/bin/rubocop -a' (Linux/Mac)");
+        }
+    }
+
     @Override
     public String escapeReservedWord(String name) {
         if (this.reservedWordsMappings().containsKey(name)) {
@@ -162,4 +174,30 @@ abstract class AbstractRubyCodegen extends DefaultCodegen implements CodegenConf
     public String escapeUnsafeCharacters(String input) {
         return input.replace("=end", "=_end").replace("=begin", "=_begin");
     }
+
+    @Override
+    public void postProcessFile(File file, String fileType) {
+        if (file == null) {
+            return;
+        }
+        String rubyPostProcessFile = System.getenv("RUBY_POST_PROCESS_FILE");
+        if (StringUtils.isEmpty(rubyPostProcessFile)) {
+            return; // skip if RUBY_POST_PROCESS_FILE env variable is not defined
+        }
+        // only process files with rb extension
+        if ("rb".equals(FilenameUtils.getExtension(file.toString()))) {
+            String command = rubyPostProcessFile + " " + file.toString();
+            try {
+                Process p = Runtime.getRuntime().exec(command);
+                int exitValue = p.waitFor();
+                if (exitValue != 0) {
+                    LOGGER.error("Error running the command ({}). Exit value: {}", command, exitValue);
+                } else {
+                    LOGGER.info("Successfully executed: " + command);
+                }
+            } catch (Exception e) {
+                LOGGER.error("Error running the command ({}). Exception: {}", command, e.getMessage());
+            }
+        }
+    }
 }
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RubyClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RubyClientCodegen.java
index dc84d632ff5..70c4fe4c343 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RubyClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RubyClientCodegen.java
@@ -29,7 +29,6 @@ import java.util.Iterator;
 import java.util.Locale;
 import java.util.Map;
 
-
 public class RubyClientCodegen extends AbstractRubyCodegen {
     private static final Logger LOGGER = LoggerFactory.getLogger(RubyClientCodegen.class);
     public static final String GEM_NAME = "gemName";