Shell hacking: launch bash from csh
Start bash like this in your .cshrc file:
exec bashPreferably, replace bash with the full path to bash.
Also, be careful if you have to run any script written in csh—if it doesn't use -f, it will execute your .cshrc file before running. Since you exec bash in your .cshrc, the script probably won't run as intended. Writing scripts in csh is inadvisable, but I've been in at least one university course that required it.