The $HOME/.tcshrc file contains commands that set or change the values of shell variables for individual users and is read by subshells. HOME is a variable for the path name for a user's home directory. The values set in $HOME/.tcshrc override those in /etc/csh.cshrc.

Use the cp command to copy /samples/.tcshrc to your $HOME directory. Then edit the new file to change or add shell variables.