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How are shell variables assigned? 




  




For shells from the C shell category (tcsh and
csh), you can use "set
variable=value" form to assign variables local to the shell, 





$ set variable_one=9999





and "setenv variable value" for environment
variables. For example, DISPLAY environmental variable can be defined
using





$ setenv DISPLAY sparky:0





For C shell category (tcsh and csh), you can get rid of 
defined or exisitng variables in local shell by using 





$ unset variable_one





and you can also get rid of defined or exisitng environmental variables
by using 





$ unsetenv DISPLAY







For shells from the Bourne shell category (bash, zsh
and sh), you can use "variable=value"
form to assign variables local to the shell, 





$ variable_two=9999





and to place the variable into the environment 
simply by using "export"





$ export DISPLAY=sparky:0





To get rid of defined or exisitng (environmental) variables, use





$ unset <variable>







For further details, RTFM on "set", 
"setenv", 
"unset", 
"unsetenv" and 
"exort".











	

		
		
		
	
		
	
	
	
	
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