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UNIX in a Nutshell: System V Edition

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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.

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