Rotate all pages by 180 degrees clockwise

PDF toolkit.
More information: <https://www.pdflabs.com/tools/pdftk-the-pdf-toolkit>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

pdftk {{input.pdf}} cat {{1-endsouth}} output {{output.pdf}}

click the source code to copy install pdftk on any operating system with command-not-found.com