HP-UX 11i June 2002 Release Notes

5
Variable The name of a variable that you may replace in a command or function
or information in a display that represents several possible values.
[] The contents are optional in formats and command descriptions. If the
contents are a list separated by |, you must choose one of the items.
{} The contents are required in formats and command descriptions. If the
contents are a list separated by |, you must choose one of the items.
... The preceding element may be repeated an arbitrary number of times.
| Separates items in a list of choices.