Shell Control Variables (6.6)
prompt my favourite: set prompt = “%m:%~%#”
ignoreeof disables Ctrl-D logout
history number of previous commands retained
mail how often to check for new mail
path list of directories where csh will look for commands (†)
noclobber protects from accidentally overwriting files in redirection
noglob turns off file name expansion
Shell variables should not to be confused with Environment variables.