Bash Shell

The Cisco Nexus 3550-H Hydra (formerly ExaLINK Hydra) command line interface provides access to a bash shell, which supports many standard UNIX commands and the ability to run scripts.

As the Nexus 3550-H is running a Debian-based operating system, users will find that they have access to many standard Unix utilities.


It is possible for the admin user to authenticate as root. Users must take extreme care when running commands as the root user. It is possible to make changes as the root user that will render the device inoperable.

Accessing the Bash shell

To access the bash shell from the CLI, use the bash command:

admin@EXALINK-HYDRA> bash

The bash command is only available to users with the admin role.


  • /run/exa/ contains a number of runtime files that are used by the management software.
  • /mnt/persist/ provides 4GB of storage for files which will persist after software/firmware updates.
  • /mnt/persist/config/ contains both the startup-config and any configs the user has saved.

Using Cisco Nexus 3550-H Hydra commands from the shell

The Nexus 3550-H command interpreter can be accessed from the Bash shell using the cli command. Commands can be provided to the command interpreter using the -c argument, for example:

admin@EXALINK-HYDRA:~$ cli -c "show interface brief"
Interface Status Transceiver Speed
--------- ------ ----------- -----

This page was last updated on Feb-18-2021.