Even if there are versions available for other OSses:

• not every tail and head accept the same set of arguments
• you may not have a compiler available to compile new tools
• you may not able to install new software on the machine you're working,
• Since you're using backticks, you're relying on whatever shell you have available, environment variables, aliases, (...)

The safest way is to rely only on the Perl interpreter.

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