Expressions
Expressions are used in @ (the C shell math operator), if, and while statements to perform arithmetic , string comparisons, file testing, and so on. exit and set also specify expressions , as can the tcsh built-in command filetest. Expressions are formed by combining variables and constants with operators that resemble those in the C programming language. Operator precedence is the same as in C. It is easiest to just remember the following precedence rules:
* / %+ -Group all other expressions inside
()s; parentheses are required if the expression contains<,>,&, or|
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