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Ubuntu - File - Copy files to different directory

#!/bin/bash                                                                                                                                                                                                 
 
for filename in *; do
  if [[ -f "$filename" ]]; then
    base=${filename%.*}
    ext=${filename#$base.}
    mkdir -p "${ext}"
    mv "$filename" "${ext}"
  fi
done

Copy all files by extension to single directory

find . -name \*.txt -exec cp {} someDirectory \;