Web Reference: SED is a stream editor. A stream editor is used to perform basic text transformations on an input stream (a file or input from a pipeline). While in some ways similar to an editor which permits scripted edits, SED works by making only one pass over the input (s), and is consequently more efficient. The -i flag probably doesn't work for you, because you followed an example for GNU sed while macOS uses BSD sed and they have a slightly different syntax. All the other answers tell you how to correct the syntax to work with BSD sed. Regarding sed, consult the sed Single Unix specification for the minimum that every system is supposed to support, the man page on your system for what your implementation supports, and the GNU sed manual for what most people out there use.
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