We've already seen how to read from standard input with
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$line = <STDIN>; # return next line INCLUDING terminal newline
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@file = <STDIN>; # return whole file with one line stored in each
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We can also easily access the command-line arguments of a PERL program. Suppose we invoke a PERL program called makePHD at the command line with
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% makePHD file1 file2 file3
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We will see later how to process these arguments using standard argument-handling conventions in UNIX
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However, the Perl diamond operator <> returns the concatenation of these three files. For example,
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@files = <>; # concatenate file arguments and store in @files
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