C Shell Predefined Shell Variables

set var=value

or by simply turning them on:

set var

In the table below, variables that accept values are shown with the equal sign followed by the type of value they accept; the value is then described. The C shell automatically sets the variables argv, cwd, home, path, prompt, shell, status, term, and user.

argv=(args)		List of arguments passed to current command:
			default is (). 
cdpath=(dirs)		List of alternate directories to search when locating
			arguments for cd, popd, or 
			pushd.
cwd=dir			Full pathname of current directory
echo			Re-display each command line before execution; same
			as csh-x command.
fignore=(chars)		List of filename suffixes to ignore during filename
			completion (see filec).
filec			If set, a filename that is partially-typed on the 
			command line can be expanded to its full name when 
			ESC is pressed. If more than one filename would match,
			type EOF to list possible completions.
hardpaths		Tell dirs to display the actual 
			pathname of any directory that is a symbolic link.
histchars=ab		A two character string that sets the characters to
			use in history-substitution and quick-substitution
			(default is !^).
history=n		Number of commands to save in history list.
home=dir		Home directory of user, initialized from HOME.
			The ` character is shorthand for this value.
ignoreeof		Ignore an end-of-file (EOF) from terminals; prevents
			accidental logout.
mail=(n file)	 	    	One or more files checked for new mail every 5 minutes
			or (if n is supplied) every n 
			seconds.
nobeep			Don't ring bell for ambiguous file completion (see
			filec).
noclobber		Don't redirecto output to an existing file;
			prevents accidental destruction of files.
noglob			Turn off filename expansion; useful in shell scripts.
nonomatch		Treat filename metacharacters as literal characters.
notify			Notify user of completed jobs right away, instead of
			waiting for the next prompt.
path=(dirs)		List of pathnames in which to search for commands to
			execute. Initialized from PATH.
prompt='str'		String that prompts for interactive input; default
			is %.
savehist=n		Number of history commands to save in ~/.history
			upon logout; they can be accessed at the next login.
shell=file		Pathname of the shell program currently in use. 
			Default is /bin/csh.
status=n		Exit status of last command. Built-in commands return
			0 (success) or 1 (failure).
term=ID			Name of terminal type, initialized to /etc/ttytype, 
			same as TERM.
time='n %c'		If command execution takes more then n CPU
			seconds, report user time, system time, elapsed
			time, and CPU percentage. 
user=name		Login name of user, initialized from USER.
verbose			Display a command after history substitution; same
			as the command csh -v.