Support for STDIN chaining (pipes)

[cverges-medallia]

I'm trying to do something like this:

cat ${file} | sed 's,# REMOVE THESE LINES.*,,g' | cr --format plain

cr doesn't appear to read from STDIN, so cannot be chained like this. While I can create a temporary file, I'd rather not so as to keep the file system clean in the event of a script failure.