To enable Bash shell on a Cisco Nexus 9000 Series Switch running NX-OS, the command feature bash-shell must be used. This command activates the Bash shell feature within NX-OS, allowing for advanced scripting and automation capabilities directly on the switch. It's important to note that proper authorization should be ensured before using this command, and its implications for security and operations should be understood. References :=
* Official Cisco Nexus 9000 Series NX-OS Fundamentals Configuration Guide
* Cisco Community Discussion on Enabling Bash Shell

FabricPath switching has the following prerequisites:
You should have a working knowledge of Classical Ethernet Layer 2 functioning.
You must install the FabricPath feature set on the default and nondefault VDC before you enable FabricPath on the switch.
See Configuring Feature Set for FabricPath for information on installing the FabricPath feature set.
You are logged onto the device.
Ensure that you have installed the Enhanced Layer 2 license.
You are in the correct virtual device context (VDC). A VDC is a logical representation of a set of system resources.
You can use the switchto vdc command with a VDC number.
You are working on the F Series module.
http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx-os/fabricpath/configuration/guide/ fp_switching.html

Reference:
NXOS Sandbox