Jailed Shell is a shell access provided to a cPanel user which is limited to his home directory and can execute limited set of command.
With Jailed Shell user can do various operations like edit, copy, move, delete etc.
Only root user has privileges to enable Jailed Shell.
To enable it follow the steps:
1) Login to WHM as root
2) Goto Account Functions
3) Click on Manage Shell Access
4) Here you can select Radio button under Jailed Shell to enable the access and selecting Radio button under Disabled Shell will disable the access.
