Changing shell variables: set

The C shell has a number of variables which are not exported to the environment. To define a temporary value for a shell variable use the command:

   set variable=value

The value of this variable will remain set until you exit from the current shell but is not exported to other C shells when they are invoked. For the variable to be set in each invocation of the shell, the set command should be included in your .cshrc file.