All UPPERCASE letters are used for most command names and for most parameter names, regardless of the type of platform. However, positional parameters for which you enter a specific value are shown in lowercase and italics, for example,

instance

.

Square brackets [ ] indicate optional parameters. You can consider any parameters without these brackets to be required.

A vertical bar | separates alternative options of which one can be entered for a parameter.

Single braces { } enclose alternative entries. Use only one of the entries. Do not type the braces when you enter the option.

Underlining indicates the default option for a parameter, if available.

Italics indicate a variable or positional parameter for which the value varies.