Difference between the Process Thumbnails and Create Thumbnail workflow steps in AEM

Workflow steps

 

The Create Thumbnail step only creates thumbnail renditions for an asset, while the Process Thumbnails step can also create a folder thumbnail and web-enabled renditions also. 

Path or directory where Dispatcher cached files?

Question: Under which directory or path AEM dispatcher server cached the data or files?

Answer: Dispatcher server cached the files under path /var/www/html/. Here you will find the /apps, /content, /libs, and /etc(client libraries).

To read and understand more on dispatcher configs and settings, please visit Experience Manager Dispatcher.

Different between sudo and sudo su?

Sudo runs a single command with root privileges and Sudo su switches you to the root user account after that all your commands will be executed with root privileges.