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 Some bash scripts
 
 ## convertPDF
-Create a new PDF with `pdf2cairo` and `convert`, create a file text with OCR `Tresseract`, and create an other PDF file with `gs` tool.
+Create a new PDF with `pdf2cairo` and `convert`, create a file text with OCR `Tresseract`, and create an other PDF file with `gs` tool. Apply on all pdf files in the current folder.
 
 ## run_music_background
 Play audio file with the play program, all the musics present in the desinged folder. In the script, indicate the music folder and the desired volume.