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Vshnu 's integration with a regular command line shell like bash or tcsh is important , since you do n't want to have to lose anything by using vshnu - - it should just add on power to what you're already doing . " csh " has prospered and evolved into " tcsh " , but " vsh " is lost and forgotten by all except by me . You can switch your current shell to tcsh by typing the shell command chsh if you have not done so already . Suggestions formaking it better are welcomed.Also note that you must be running in the tcsh shell for cadence to work . I still do as much in tcsh as I do in vshnu , and work with them as two modes of one shell environment .