The Red Hat Linux VDI system will use either Bash or Ksh, depending on what you have configured in your UNIX account. See how to change your shell in the Environment and shells article. Please be aware that Csh, according to our policy, is not supported at all in Linux VDI.
If you are currently using Csh as your login shell you will need to contact our Service Desk to change it to one of the supported ones.
Other shell changes are still not propagated automatically yet, so will need a notification to Service Desk after they have been changed.