Web Reference: 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. 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. OS X's sed uses -E for ERE and GNU sed uses -r. -E is an alias for -r in GNU sed (added in 4.2, not documented until 4.3). Newer versions of FreeBSD and NetBSD sed support both -E and -r. OpenBSD sed only supports -E.
YouTube Excerpt: In this episode of Linux Crash Course, we explore the
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