UNIX in a Nutshell: System V Edition

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.SM

.SM x [y] [z]

Reduce a string by one point. Multiple arguments are concatenated, with one of them reduced in size, as described in this table.

# of ArgumentsAction
OneReduce size of first string by one point.
TwoReduce size of first string by one point.
ThreeReduce size of middle string by one point.

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