Created
January 29, 2024 02:16
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Recognize file headers and rename file extensions
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| #!/bin/bash | |
| # test all files | |
| for file in *; do | |
| if [ -f "$file" ]; then | |
| # read first 3 bytes | |
| bytes=$(head -c 3 "$file" | od -An -t x1 | tr -d ' \n') | |
| # test file bytes | |
| case $bytes in | |
| 504b03) | |
| # ZIP | |
| mv "$file" "${file}.zip" | |
| ;; | |
| ffd8ff) | |
| # JPG | |
| mv "$file" "${file}.jpg" | |
| ;; | |
| 255044) | |
| mv "$file" "${file}.pdf" | |
| ;; | |
| 524946) | |
| # WEBM | |
| mv "$file" "${file}.webm" | |
| ;; | |
| # Others | |
| *) | |
| # not match | |
| ;; | |
| esac | |
| fi | |
| done | |
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