Wolfgang Walther
31706d4a55
GNU sed's man page has this to say about "-i":
Because -i takes an optional argument, it should not be followed by
other short options:
[..]
sed -iE '...' FILE
This is equivalent to --in-place=E, creating FILEE as backup of FILE
This means all "-iX" did not have the intended effect X, so we can
instead remove them.