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Command-Line Arguments warns that the use of command-line arguments in a Java program may cause that program to be unportable (that is, it will not be 100% Pure Java). If a program requires command-line arguments, then it should follow the POSIX conventions for them. The POSIX conventions are summarized here:
- An option is a hyphen followed by a single alphanumeric character, like this:
-o
.- An option may require an argument (which must appear immediately after the option); for example,
-o argument
or-oargument
.- Options that do not require arguments can be grouped after a hyphen, so, for example,
-lst
is equivalent to-t -l -s
.- Options can appear in any order; thus
-lst
is equivalent to-tls
.- Options can appear multiple times.
- Options precede other nonoption arguments:
-lst nonoption
.- The
--
argument terminates options.- The
-
option is typically used to represent one of the standard input streams.
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