nodejs
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‎doc/api/child_process.markdown‎
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@@ -139,13 +139,13 @@ generated output.
 
 ```js
 const exec = require('child_process').exec;
-const child = exec('cat *.js bad_file | wc -l',
-  (error, stdout, stderr) => {
-    console.log(`stdout: ${stdout}`);
-    console.log(`stderr: ${stderr}`);
-    if (error !== null) {
-      console.log(`exec error: ${error}`);
-    }
+exec('cat *.js bad_file | wc -l', (error, stdout, stderr) => {
+  if (error) {
+    console.error(`exec error: ${error}`);
+    return;
+  }
+  console.log(`stdout: ${stdout}`);
+  console.log(`stderr: ${stderr}`);
 });
 ```