angle bracket
Angle brackets ( < > ) indicate that the enclosed element (parameter, value, or information) is mandatory.
argument
A file name or other data that is provided to a command in order for the command to use it as an input. Arguments are pieces of information that tell a command what to do and where to send the results.
ellipsis
The ellipsis symbol of three periods ( ... ) means "and so on" and indicates that the preceding element (parameter, value, or information) can be repeated several times in a command line.
italics
Italic text indicates information that you must supply with the appropriate value. It is an option or parameter to be replaced with a value.
option
A type of argument that modifies the behavior of the command. An option is a single-letter or full word that modifies the way a command behaves in some predetermined way.
pipe
The pipe symbol (vertical line) means "or" and indicates a choice within an element.
square bracket
Square brackets ( [ ] ) indicate that the enclosed element (parameter, value, or information) is optional.
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