diff --git a/README.md b/README.md
index 5d28aae..1bc2114 100644
--- a/README.md
+++ b/README.md
@@ -15,10 +15,18 @@ $ O={operator_name} node preprocessing.js
 To generate operator assets for showcase page
 ```
 ``` bash
+$ node preprocessing.js -a
+To generate all operator assets for showcase page
+```
+``` bash
 $ O={operator_name} node preprocessing.js -i
 To initialize folder and config file for an operator
 ```
 ``` bash
+$ node preprocessing.js -d
+To generate directory.json
+```
+``` bash
 $ O={operator_name} pnpm run dev
 Live showcase page server for development
 ```
@@ -26,10 +34,6 @@ Live showcase page server for development
 $ O={operator_name} pnpm run build
 Build showcase webpage for an operator
 ```
-``` bash
-$ node build_all.js
-Build showcase webpages for all operators
-```
 ### Webpage & JavaScript
 
 Add query string `settings` to bring up the settings panel to adjust your settings. Then use appropriate JavaScript code to load your settings
diff --git a/build_all.js b/build_all.js
deleted file mode 100644
index 611c87b..0000000
--- a/build_all.js
+++ /dev/null
@@ -1,15 +0,0 @@
-import path from 'path'
-import fs from 'fs'
-import { execSync } from 'child_process'
-import { fileURLToPath } from 'url'
-
-let __dirname
-__dirname = __dirname || path.dirname(fileURLToPath(import.meta.url))
-
-const directory = path.join(__dirname, 'operator');
-fs.readdir(directory, function (err, files) {
-  files.forEach(function (file) {
-    if (file.startsWith('_')) return;
-    console.log(execSync(`O=${file} node preprocessing.js && O=${file} pnpm run build`).toString());
-  });
-});
\ No newline at end of file
diff --git a/lib/exec.js b/lib/exec.js
new file mode 100644
index 0000000..e5aebcc
--- /dev/null
+++ b/lib/exec.js
@@ -0,0 +1,8 @@
+import { execSync } from 'child_process'
+
+export default function (config) {
+    for (const [key, _] of Object.entries(config.operators)) {
+        if (key.startsWith('_')) break;
+        console.log(execSync(`O=${key} node preprocessing.js && O=${key} pnpm run build`).toString());
+    }
+}
\ No newline at end of file
diff --git a/preprocessing.js b/preprocessing.js
index de56ddb..4e4dbd9 100644
--- a/preprocessing.js
+++ b/preprocessing.js
@@ -8,26 +8,35 @@ import path from 'path'
 import { fileURLToPath } from 'url'
 import init from './lib/initializer.js'
 import directory from './lib/directory.js'
+import exec from './lib/exec.js'
+
+let __dirname
+__dirname = __dirname || path.dirname(fileURLToPath(import.meta.url))
+const config = getConfig(__dirname)
 
 let mode = null
 const OPERATOR_NAME = process.env.O;
+const op = process.argv[2]
+
 if (process.argv[1].endsWith('vite.js')) {
     mode = "VITE"
 } else {
     mode = "NODE"
 }
-assert(OPERATOR_NAME !== undefined, 'Please set the environment variable O to the operator name.')
 
-if (mode === null) {
-    console.log('Please set the environment variable O to the operator name.')
-    console.log('Or use the -o flag to specify the operator name.')
-    process.exit(1)
+switch (op) {
+    case '-a':
+        exec(config)
+        process.exit(0)
+    case '-d':
+        directory(config, __dirname)
+        process.exit(0)
+    default:
+        break
 }
 
-let __dirname
-__dirname = __dirname || path.dirname(fileURLToPath(import.meta.url))
+assert(OPERATOR_NAME !== undefined, 'Please set the environment variable O to the operator name.')
 
-const config = getConfig(__dirname)
 const OPERATOR_SOURCE_FOLDER = path.join(__dirname, config.folder.operator)
 const OPERATOR_RELEASE_FOLDER = path.join(__dirname, config.folder.release, OPERATOR_NAME)
 const SHOWCASE_PUBLIC_FOLDER = path.join(__dirname, "public")
@@ -36,15 +45,10 @@ const EXTRACTED_FOLDER = path.join(OPERATOR_SOURCE_FOLDER, OPERATOR_NAME, 'extra
 const OPERATOR_SHARE_FOLDER = path.join(OPERATOR_SOURCE_FOLDER, '_share')
 if (mode === 'NODE') {
 
-    const op = process.argv[2]
-
     switch (op) {
         case '-i':
             init(OPERATOR_NAME, __dirname, EXTRACTED_FOLDER)
             process.exit(0)
-        case '-d':
-            directory(config, __dirname)
-            process.exit(0)
         default:
             break
     }