/usr/share/nanoblogger/plugins/page/format/autobr.sh is in nanoblogger 3.4.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # NanoBlogger Auto br plugin to convert line breaks to HTML
# 2 line breaks (blank line) = <br /><br />
nb_msg "$plugins_entryfilteraction `basename $nb_plugin` ..."
MKPAGE_CONTENT=`echo "$MKPAGE_CONTENT" |sed -e '/^$/ s//\<br \/\>\<br \/\>/g'`
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