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Example attribute reference in an attribute value:
Many default values use the attribute expansion mechanism to make configuration easier and more generic.
In addition to variable expansion, it is also possible to include the contents of a file as the value of an attribute. This is done by putting the filename in backquotes (`). Within the backquotes, variable expansion will still work so that files can be specified relative to some path. The backquotes and the filename will be replaced by the contents of the file if it exists. All whitespace (spaces, tabs, newlines, etc) in the file are condensed to one space before the substitution takes place. The following are some examples of the use of the backquoting scheme:
Last modified: Sun Dec 15 12:11:37 PST