A bash function for moving a file to a folder, using a sequential rename if the file already exists.

safe_mv.sh

#!/bin/sh

# Usage: safe_mv dir1/file.txt dir2
#        If dir2 contains "file.txt", the moved file will be renamed to "file1.txt"
function safe_mv() {
  FULL_PATH=$1
  FILE_NAME=$(basename $FULL_PATH)
  FILE_NAME_WITHOUT_EXT=${FILE_NAME%.*}
  EXT=${FILE_NAME#*.}
  # Trim any trailing slashes
  DEST_PATH="${2%/}"

  if [ -e "$DEST_PATH/$FILE_NAME" ]; then
    FILE_COUNTER=1

    while [ -f "$DEST_PATH/$FILE_NAME_WITHOUT_EXT$FILE_COUNTER.$EXT" ]; do
      (( FILE_COUNTER=FILE_COUNTER+1 ))
    done

    mv "$FULL_PATH" "$DEST_PATH/$FILE_NAME_WITHOUT_EXT$FILE_COUNTER.$EXT"
  else
    mv "$FULL_PATH" "$DEST_PATH"
  fi
}