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README.md

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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```