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Summary: Learn how to efficiently sort the contents of a file using Perl, with examples and explanations on sorting techniques in Perl programming.
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Sorting a file in Perl can be achieved using various techniques depending on the requirements and the size of the file. Here, we'll explore two common methods to sort the contents of a file in Perl.

Using Perl's sort Function

Perl's sort function is versatile and efficient for sorting data. When sorting a file, you typically read its contents into an array, sort the array, and then write the sorted array back to the file.

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In this example, input.txt is the file to be sorted, and output.txt will contain the sorted contents. We read the file into the @lines array, sort it using Perl's sort function, and then write the sorted array back to output.txt.

Using Command-Line Sorting

If you prefer not to write Perl code for sorting, you can utilize command-line sorting utilities like sort itself or sort in combination with other Unix utilities. For example:

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These commands can be executed directly in the terminal or within a Perl script using system() or backticks.

Whether you choose Perl's sort function or command-line sorting depends on your specific requirements and preferences. Both methods are efficient and effective for sorting files in Perl.