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.ev [n ]

Change environment to n . For example, many requests that affect horizontal position, hyphenation, or text adjustment are stored in the current environment. If n is omitted, restore previous environment. The initial value of n is 0, and 0 <= n <= 2. You must return to the previous environment by using .ev with no argument, or you will get a stack overflow. (ditroff simply ignores an invalid argument and issues a warning.)

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