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Useful commands for me to remember
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| # install tolerable version of ruby | |
| # brew install rbenv | |
| rbenv install 3.1.2 # lookup current ruby version | |
| rbenv rehash | |
| rbenv global 3.1.2 | |
| # merge pdfs in directory (sorted, so use numerical prefixes in order) | |
| # brew install poppler | |
| pdfunite *.pdf output.pdf |
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