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- # Collection of Bash code snippets, mostly one liners, to ease file handling among other things
- Collection of notes
- #### rename files to reverse order
-
- `N=1; ls -tr -1 *.jpg | tac | while read file; do mv "$file" "$N".jpg; N=$((N+1)); done`
-
- #### rotate all images using imagemagick
-
- `mogrify -rotate 180 *.jpg`
- `mogrify` overwrites existing images which is what makes it different from `convert`
-
- #### cut poly-shape out of image, crop image to its boundaries, fill surrounding holes in certain color or transparent (for all jpgs in folder)
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- `for f in ./*.jpg; do convert "$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`
-
- #### do something inside each folder of this folder
-
- ```
- for d in */; do
- cd $d;
- for dir in */; do
- for frontpage in "$dir"*.jpg; do
- echo convert "$frontpage" -resize 500x500 "$frontpage"_500px.jpg
- break 1
- done
- done
- cd ..;
- done
- ```
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