~/git/drafts$ pandoc --from markdown --to slidy PZIyear2/re-search-able_notes/2017_05_27-grad-presentation.md -o PZIyear2/re-search-able_notes/2017_05_27-grad-presentation-slidy.md
~/git/drafts$ print  sed -i '1s/^/<added text> /' PZIyear2/re-search-able_notes/2017_05_27-grad-presentation-slidy.md