diff --git a/README.md b/README.md
index dc44031..384d0d0 100644
--- a/README.md
+++ b/README.md
@@ -6,8 +6,8 @@ typed-env can help us better handle environment variables
 
 ### [commands](#usage-typed-env-cli)
 
-- [diff-env](#diff-env)
-- [diff-env-name](#diff-env-name)
+- [gen-diff-env](#gen-diff-env)
+- [gen-diff-env-name-type](#gen-diff-env-name-type)
 - [gen-env](#gen-env)
 - [gen-env-name-type](#gen-env-name-type)
 - [gen-typed-env-call-usage-report](#gen-typed-env-call-usage-report)
@@ -33,13 +33,13 @@ $ npm install @placeholdersoft/typed-env
 
 ## Usage typed-env-cli
 
-### `diff-env`
+### `gen-diff-env`
 
 ```
-Output diff env
+Generate diff env
 
 USAGE
-  $ typed-env diff-env -p <value> -a <value>
+  $ typed-env gen-diff-env -p <value> -a <value>
 
 FLAGS
   -a, --after-env=<value>  (required) enter change env json
@@ -49,16 +49,16 @@ DESCRIPTION
   Output diff env
 
 EXAMPLES
-  $ typed-env diff-env -a "$(env)" -p "$(env)"
+  $ typed-env diff-env -p "$(env)" -a "$(env)"
 ```
 
-### `diff-env-name`
+### `gen-diff-env-name-type`
 
 ```
-Output diff env name
+Generate diff env name type definition
 
 USAGE
-  $ typed-env diff-env-name -p <value> -a <value>
+  $ typed-env gen-diff-env-name-type -p <value> -a <value>
 
 FLAGS
   -a, --after-env=<value>  (required) enter change env json
@@ -68,7 +68,7 @@ DESCRIPTION
   Output diff env name
 
 EXAMPLES
-  $ typed-env diff-env-name -a "$(env)" -p "$(env)"
+  $ typed-env gen-diff-env-name-type -p "$(env)" -a "$(env)"
 ```
 
 ### `gen-env`
diff --git a/packages/typed-env-cli/package.json b/packages/typed-env-cli/package.json
index 6661965..607aebf 100644
--- a/packages/typed-env-cli/package.json
+++ b/packages/typed-env-cli/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@placeholdersoft/typed-env-cli",
-  "version": "0.0.5",
+  "version": "0.0.6",
   "type": "commonjs",
   "bin": {
     "typed-env": "./bin/run"
diff --git a/packages/typed-env-cli/src/commands/diff-env-name.ts b/packages/typed-env-cli/src/commands/diff-env-name.ts
deleted file mode 100644
index c7cfc42..0000000
--- a/packages/typed-env-cli/src/commands/diff-env-name.ts
+++ /dev/null
@@ -1,41 +0,0 @@
-import { Command, Flags } from '@oclif/core';
-import { parseEnv } from '../lib/utils/util';
-
-export default class DiffEnvName extends Command {
-  static override description = 'Output diff env name';
-
-  static override examples = [
-    `$ typed-env diff-env-name -a "$(env)" -p "$(env)"`,
-  ];
-
-  static override flags = {
-    'prev-env': Flags.string({
-      char: 'p',
-      description: 'enter current env json',
-      required: true,
-    }),
-
-    'after-env': Flags.string({
-      char: 'a',
-      description: 'enter change env json',
-      required: true,
-    }),
-  };
-
-  async run(): Promise<void> {
-    const { flags } = await this.parse(DiffEnvName);
-
-    const prev = parseEnv(flags['prev-env']);
-    const after = parseEnv(flags['after-env']);
-
-    const names: { [key in string]: string } = {};
-    for (const [k] of Object.entries(after)) {
-      // only print changed vars
-      if (prev[k] !== after[k]) {
-        names[k] = k;
-      }
-    }
-
-    console.log(names);
-  }
-}
diff --git a/packages/typed-env-cli/src/commands/diff-env.ts b/packages/typed-env-cli/src/commands/diff-env.ts
deleted file mode 100644
index 695c7d9..0000000
--- a/packages/typed-env-cli/src/commands/diff-env.ts
+++ /dev/null
@@ -1,39 +0,0 @@
-import { Command, Flags } from '@oclif/core';
-import { parseEnv } from '../lib/utils/util';
-
-export default class DiffEnv extends Command {
-  static override description = 'Output diff env';
-
-  static override examples = [`$ typed-env diff-env -a "$(env)" -p "$(env)"`];
-
-  static override flags = {
-    'prev-env': Flags.string({
-      char: 'p',
-      description: 'enter current env json',
-      required: true,
-    }),
-
-    'after-env': Flags.string({
-      char: 'a',
-      description: 'enter change env json',
-      required: true,
-    }),
-  };
-
-  async run(): Promise<void> {
-    const { flags } = await this.parse(DiffEnv);
-
-    const prev = parseEnv(flags['prev-env']);
-    const after = parseEnv(flags['after-env']);
-
-    const env: string[] = [];
-
-    for (const [k, v] of Object.entries(after)) {
-      if (prev[k] !== after[k]) {
-        env.push(`${k}=${v}`);
-      }
-    }
-
-    console.log(env);
-  }
-}
diff --git a/packages/typed-env-cli/src/commands/gen-diff-env-name-type.ts b/packages/typed-env-cli/src/commands/gen-diff-env-name-type.ts
new file mode 100644
index 0000000..0ec08db
--- /dev/null
+++ b/packages/typed-env-cli/src/commands/gen-diff-env-name-type.ts
@@ -0,0 +1,74 @@
+import { Command, Flags } from '@oclif/core';
+import { parseEnv } from '../lib/utils/util';
+import path from 'path';
+import fs from 'fs';
+import { ensureDirSync } from '../lib/utils/fs';
+
+export default class GenDiffEnvNameType extends Command {
+  static override description = 'Generate diff env name type definition';
+
+  static override examples = [
+    `$ typed-env diff-env-name -p "$(env)" -a "$(env)"`,
+  ];
+
+  static override flags = {
+    'prev-env': Flags.string({
+      char: 'p',
+      description: 'enter current env json',
+      required: true,
+    }),
+
+    'after-env': Flags.string({
+      char: 'a',
+      description: 'enter change env json',
+      required: true,
+    }),
+
+    output: Flags.string({
+      char: 'o',
+      description: 'enter the output file path',
+    }),
+  };
+
+  async run(): Promise<void> {
+    const { flags } = await this.parse(GenDiffEnvNameType);
+
+    const prev = parseEnv(flags['prev-env']);
+    const after = parseEnv(flags['after-env']);
+
+    const envNames: { [key in string]: string } = {};
+    for (const [k] of Object.entries(after)) {
+      // only print changed vars
+      if (prev[k] !== after[k]) {
+        envNames[k] = k;
+      }
+    }
+
+    const fileContent = `export const AllProjectDiffEnvNames = ${JSON.stringify(
+      envNames,
+      null,
+      2
+    )} as const;
+export type ProjectDiffEnvName = keyof typeof AllProjectDiffEnvNames;`;
+
+    if (flags.output) {
+      const tempstats = fs.statSync(flags.output);
+
+      if (tempstats.isDirectory()) {
+        ensureDirSync(flags.output);
+        const outputFilePath = path.join(flags.output, 'env.d.ts');
+        fs.writeFileSync(outputFilePath, fileContent);
+
+        console.log(`output file: ${outputFilePath}`);
+      } else {
+        const folderPath = path.parse(flags.output);
+        ensureDirSync(folderPath.dir);
+        fs.writeFileSync(flags.output, fileContent);
+
+        console.log(`output file: ${flags.output}`);
+      }
+    } else {
+      console.log(fileContent);
+    }
+  }
+}
diff --git a/packages/typed-env-cli/src/commands/gen-diff-env.ts b/packages/typed-env-cli/src/commands/gen-diff-env.ts
new file mode 100644
index 0000000..9589b81
--- /dev/null
+++ b/packages/typed-env-cli/src/commands/gen-diff-env.ts
@@ -0,0 +1,65 @@
+import { Command, Flags } from '@oclif/core';
+import { parseEnv } from '../lib/utils/util';
+import path from 'path';
+import fs from 'fs';
+import { ensureDirSync } from '../lib/utils/fs';
+
+export default class GenDiffEnv extends Command {
+  static override description = 'Generate diff env';
+
+  static override examples = [`$ typed-env diff-env -p "$(env)" -a "$(env)"`];
+
+  static override flags = {
+    'prev-env': Flags.string({
+      char: 'p',
+      description: 'enter current env json',
+      required: true,
+    }),
+
+    'after-env': Flags.string({
+      char: 'a',
+      description: 'enter change env json',
+      required: true,
+    }),
+
+    output: Flags.string({
+      char: 'o',
+      description: 'enter the output file path',
+    }),
+  };
+
+  async run(): Promise<void> {
+    const { flags } = await this.parse(GenDiffEnv);
+
+    const prev = parseEnv(flags['prev-env']);
+    const after = parseEnv(flags['after-env']);
+
+    const env: string[] = [];
+
+    for (const [k, v] of Object.entries(after)) {
+      if (prev[k] !== after[k]) {
+        env.push(`${k}=${v}`);
+      }
+    }
+
+    if (flags.output) {
+      const tempstats = fs.statSync(flags.output);
+
+      if (tempstats.isDirectory()) {
+        ensureDirSync(flags.output);
+        const outputFilePath = path.join(flags.output, '.env');
+        fs.writeFileSync(outputFilePath, env.join('\n'));
+
+        console.log(`output file: ${outputFilePath}`);
+      } else {
+        const folderPath = path.parse(flags.output);
+        ensureDirSync(folderPath.dir);
+        fs.writeFileSync(flags.output, env.join('\n'));
+
+        console.log(`output file: ${flags.output}`);
+      }
+    } else {
+      console.log(env.join('\n'));
+    }
+  }
+}