diff --git a/src/commands/validate.ts b/src/commands/validate.ts
new file mode 100644
index 0000000..cf7618f
--- /dev/null
+++ b/src/commands/validate.ts
@@ -0,0 +1,58 @@
+import { Command } from 'commander';
+import * as fs from 'fs';
+import * as path from 'path';
+import { parseEnvFile } from '../core/parser';
+import { validateEnv, parseSchemaFromEnv } from '../core/validator';
+import { EnvSchema } from '../core/types';
+
+export function createValidateCommand(): Command {
+  const cmd = new Command('validate');
+  
+  cmd
+    .description('Validate .env files against a schema')
+    .option('-e, --env <path>', 'Path to .env file', '.env')
+    .option('-s, --schema <path>', 'Path to schema.json file')
+    .action(async (options) => {
+      try {
+        const envPath = path.resolve(options.env);
+        
+        if (!fs.existsSync(envPath)) {
+          console.error(`Error: .env file not found at ${envPath}`);
+          process.exit(1);
+        }
+
+        const parsedEnv = parseEnvFile(envPath);
+        let schema: EnvSchema;
+
+        if (options.schema) {
+          const schemaPath = path.resolve(options.schema);
+          if (!fs.existsSync(schemaPath)) {
+            console.error(`Error: Schema file not found at ${schemaPath}`);
+            process.exit(1);
+          }
+          const schemaContent = fs.readFileSync(schemaPath, 'utf-8');
+          schema = JSON.parse(schemaContent);
+        } else {
+          schema = parseSchemaFromEnv(parsedEnv.flat);
+        }
+
+        const result = validateEnv(parsedEnv.flat, schema);
+
+        if (result.valid) {
+          console.log('✓ Validation passed successfully!');
+          process.exit(0);
+        } else {
+          console.error('✗ Validation failed:');
+          for (const error of result.errors) {
+            console.error(`  - ${error.field}: ${error.message}`);
+          }
+          process.exit(1);
+        }
+      } catch (error) {
+        console.error('Error during validation:', (error as Error).message);
+        process.exit(1);
+      }
+    });
+
+  return cmd;
+}