add others(pdf to txt)

pdf to txt
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onceupon 2017-11-29 14:00:46 +08:00 committed by GitHub
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@ -1651,6 +1651,11 @@ wait $PID
wait ${!}
#wait ${!} to wait till the last background process ($! is the PID of the last background process)
```
##### pdf to txt
```bash
sudo apt-get install poppler-utils
pdftotext example.pdf example.txt
```
## System