I thought I had seen something like this documented where you could pipe in content to a wp-cli arg like so:
wp post create --post_type=page --post_title="Blah" --post_content= < content.txt
I tried it and it didn't work, however. Is this possible?
OK, solution was buried in the command help.
Basically, just drop the --post_content arg and replace with the name of the file.