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# Collection of Bash code snippets, mostly one liners, to ease file handling among other things |
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# Collection of Bash code snippets, mostly one liners, to ease file handling among other things |
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Collection of notes |
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Collection of notes |
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#### rename files to reverse order |
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#### rename files to reverse order |
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```N=1; ls -tr -1 *.jpg | tac | while read file; do mv "$file" "$N".jpg; N=$((N+1)); done``` |
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`N=1; ls -tr -1 *.jpg | tac | while read file; do mv "$file" "$N".jpg; N=$((N+1)); done` |
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#### rotate all images using imagemagick |
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#### rotate all images using imagemagick |
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`mogrify` overwrites existing images which is what makes it different from `convert` |
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`mogrify` overwrites existing images which is what makes it different from `convert` |
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#### cut poly-shape out of image, crop image to its boundaries, fill surrounding holes in certain color or transparent (for all jpgs in folder) |
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#### cut poly-shape out of image, crop image to its boundaries, fill surrounding holes in certain color or transparent (for all jpgs in folder) |
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`for f in ./*.jpg; do convert "$f" \( -clone 0 -fill black -colorize 100 -fill white -draw "polygon 3276,2421 4945,2407 4956,4708 3287,4722" \) -alpha off -compose copy_opacity -composite -trim +repage 41050648/"$f"_left.jpg; done` |
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`for f in ./*.jpg; do convert "$f" \( -clone 0 -fill black -colorize 100 -fill white -draw "polygon 3276,2421 4945,2407 4956,4708 3287,4722" \) -alpha off -compose copy_opacity -composite -trim +repage 41050648/"$f"_left.jpg; done` |
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#### do something inside each folder of this folder |
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#### do something inside each folder of this folder |
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``` |
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``` |
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for d in */; do |
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for d in */; do |
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cd $d; |
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cd $d; |