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Perl in a Nutshell

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Standard Modules
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$fh->open(filename[, mode[, perms]])

Opens the newly-created filehandle. Accepts one, two, or three parameters. With one parameter, it acts as a front-end for Perl's built-in open function. With two parameters, the first parameter is a filename and the second is the open mode, optionally followed by a third parameter, the file permission value.

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Reference: new_tmpfileBook Index8.91 IO::File