Move a defined proportion of files from one folder to another. Particularly useful for directories with large numbers of files.

mv-bulk.sh

#!/bin/bash

DIR_FROM=$1
DIR_TO=$2
PERCENTAGE=$3
COUNTER=0

for file in $DIR_FROM*; do
  val=$RANDOM
  # Max possible value is 32760
  ((split=32760*$PERCENTAGE/100))
  if (($val < $split)); then
    echo "Moving: $file"
    mv "$file" $DIR_TO
    ((COUNTER=$COUNTER+1))
  fi
done

echo "Moved $COUNTER files."