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Perl Language Reference Guide The Harvard Computer Society

perl Language Reference GuideThe Harvard Computer SocietyPERLLANGUAGE Reference GUIDEC opyright 2000 The President and Fellows of Harvard CollegeAll rights reservedPerl Language Reference GuideThe Harvard Computer SocietyTable of ContentsIntroduction ..1 Invocation and #!.. 1 Basic 1 Hello, 2 Numerical Data and Operators .. 2 Strings .. 2 Single and Double Quoting .. 3 Comparison Operators: Arithmetic vs. String .. 3undef .. 3 Lists ..4 Subscripting .. 4 Array Sizes .. 4 Some Array Functions .. 5 Context .. 5 Control .. 6 Unless .. 6 Doing Them Backwards .. 6 And, Or .. 6 What is Truth?.. 7 While .. 7 For .. 7 Foreach .. 7last, next, and () and Values() .. 9 Deleting .. 9 Filehandles and <STDIN> and <> .. 10 Make Your Own Filehandles .. 11 Chopping .. 11 Printing to Filehandles .. 11 Handling File Errors .. 11 File 12 Pipes.

Perl’s second type of data structure is the list, or array. A list is an ordered series of scalars. List variables start with the @ character. In your program, you can write arrays as a sequence of comma-separated values in parentheses. @a = (1, 2, 3);

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