For some problems like matching a pattern over an unknown number of lines or "replace the last occurence of ..." the option
-z of GNU
sed is really helpful. How can I achieve the same thing portable?
Example: I have a file
yellow, green, blue, black, purple, orange, white, red, brown are some colours
and I want to replace the last comma of the file with
and. Note that it is unknown in which line or where in that line the comma is. With GNU
sed I can do
sed -z 's/\(.*\),/ \1 and/'
to get the desired output
yellow, green, blue, black, purple, orange, white, red and brown are some colours
How can I do it in a portable way, that will run with any POSIX