We have two .po files, each from different branches of a piece of software.
We need to combine these into a single .po file.
There are duplicates between the two files, and the ideal handling would be for one file's strings to be favoured (consistently).
We have a SUSE system so the --output-file doesn't seem to have the behaviour of ignoring/merging duplicates which the Sun version has according to a man page I found from a web search. (We do not have a Sun machine handy!)