sed in-place flag that works both on Mac (BSD) and Linux

Question

Is there an invocation of sed todo in-place editing without backups that works both on Linux and Mac? While the BSD sed shipped with OS X seems to

Answer 1

The -i option is not part of POSIX Sed. A more portable method would be to use Vim in Ex mode:

ex -sc '%s/alfa/bravo/|x' file

1. % select all lines

2. s replace

3. x save and close