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OS X + Sed: “extra characters at the end of l command” Error

PROBLEM

When executing the following command on OS X…
1
sed -i 's/megatron/pony/g' /path/to/file.txt
… the following error occurs:-
sed: 1: "/path/to/file.txt": extra characters at the end of l command

SOLUTION

Unlike Ubuntu, OS X requires the extension to be explicitly specified. The workaround is to set an empty string:-
1
sed -i '' 's/megatron/pony/g' /path/to/file.txt
… and now, Megatron has transformed into a pony.
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