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UNIX in a Nutshell: System V Edition

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.HX

.HX dlevel rlevel text

User-supplied exit macro executed before printing the heading.

The derived level dlevel is equal to the real level rlevel if .H is invoked by the user. If .HU is used, dlevel is equal to the value of the Hu register, and rlevel is zero. In both cases, text is the actual heading text.

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