+ Notational conventions in this document
+ ---------------------------------------
+
+ Throughout this document, we use the following conventions in command
+ examples:
+
+ $ command Any line starting with a dollar sign
+ ($) is a command line.
+
+ { word1 | word2 | word3 } This denotes a mandatory choice, to be
+ replaced with one of the given words.
+ A simple example would be this:
+
+ $ echo { FOO | BAR | COOKIE }
+
+ which is to be understood as one of
+ these:
+
+ $ echo FOO
+ - or -
+ $ echo BAR
+ - or -
+ $ echo COOKIE
+
+ [ word1 | word2 | word3 ] Similar to { word1 | word2 | word3 }
+ except it's optional to give any of
+ those. In addition to the examples
+ above, this would also be valid:
+
+ $ echo
+
+ {{ target }} This denotes a mandatory word or
+ sequence of words of some sort. A
+ simple example would be this:
+
+ $ type {{ filename }}
+
+ which is to be understood to use the
+ command 'type' on some file name
+ determined by the user.
+
+ [[ options ]] Similar to {{ target }}, but is
+ optional.
+
+ Note that the notation assumes spaces around {, }, [, ], {{, }} and
+ [[, ]]. This is to differentiate from OpenVMS directory
+ specifications, which also use [ and ], but without spaces.
+
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