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#!/usr/bin/perl print "Hello, World!\n"; The hash mark character introduces a comment in Perl, which runs up to the end of the line of code and is ignored by the compiler (except on Windows). The comment used here is of a special kind: it’s called the shebang line.
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#!usr/bin/perl – called the "shebang line", after the hash symbol (#) and ! (bang) at the beginning of the line. It is also known as the interpreter directive. # – the number sign, also called the hash symbol. In Perl, the # indicates the start of a comment. It instructs perl to ignore the rest of the line and not execute it as script code.
HTML::WikiConverter – a Perl module to convert HTML to wiki markup language. Write the bash script "doc2mw", and the perl script "html2mw", both shown below. Call doc2mw passing the word document as parameter. i.e. > doc2mw my_word.doc doc2mw a bash script taking a single parameter, which calls wvHtml followed by html2mw.
The effect of Perl modules are usually limited to the current scope in which it was loaded. It is common for Perl modules to have embedded documentation in Perl's Plain Old Documentation format. POD imposes little structure on the author. It is flexible enough to be used to write articles, web pages and even entire books such as Programming Perl.
More broadly using #!/usr/bin/env for any script still has some portability issues with OpenServer 5.0.6 and Unicos 9.0.2 which have only /bin/env and no /usr/bin/env. Using #!/usr/bin/env results in run-time indirection, which has the potential to degrade system security; for this reason some commentators recommend against its use [ 17 ] in ...
* This is needed to make it possible for login to set per-user * process limit to something lower than processes root is running. */ bool isOverMaximumProcessLimit {// TODO implement} Some languages, including D and Swift, allow blocks to be nested while other do not, including C and C++.
The 2htdp/image library provides convenient functions for constructing images. This library is mainly used by students in How to Design Programs (HtDP) based courses. In the following example, a sierpinski function is defined and called (at the same time) to generate a Sierpinski triangle of depth 8.