bash waiting for files to appear on multiple hosts

await_files.sh

#!/bin/sh
await_file_received()
{
  printf "===> checking the number of raw files on all workstations...\n"
  fileHOST=`find /files/dict -type f | wc -l`
  file_REMOTE_HOST_1=`ssh uesr@${REMOTE_HOST_1} "find /files/dict  -type f | wc -l"`
  file_REMOTE_HOST_2=`uesr@${REMOTE_HOST_2} "find /files/dict  -type f | wc -l"`
  ## Calculating diff using bc for details read `man bc`
  diff_HOST_REMOTE_1=`echo ${fileHOST} - ${file_REMOTE_HOST_1} | bc`
  diff_HOST_REMOTE_2=`echo ${fileHOST} - ${file_REMOTE_HOST_2} | bc`
  printf "===> fileHOST: ${fileHOST} file_REMOTE_HOST_1:${file_REMOTE_HOST_1} file_REMOTE_HOST_2:${file_REMOTE_HOST_2} ...\n"
  printf "===> diff_HOST_REMOTE_2: ${diff_HOST_REMOTE_2} diff_HOST_REMOTE_1:${diff_HOST_REMOTE_1} ...\n"
  SLEEP=300
  while [ $SLEEP -gt 0 ] && [ $diff_HOST_REMOTE_2 -gt 0 ] && [ $diff_HOST_REMOTE_1 -gt 0 ];
  do
    printf "waiting $SLEEP more seconds for diff_HOST_REMOTE_2: ${diff_HOST_REMOTE_2} diff_HOST_REMOTE_1:${diff_HOST_REMOTE_1} to be zero ...\n"

    sleep 10;
    file_REMOTE_HOST_1=`ssh uesr@${REMOTE_HOST_1} "find /files/dict  -type f | wc -l"`
    file_REMOTE_HOST_2=`uesr@${REMOTE_HOST_2} "find /files/dict  -type f | wc -l"`
    diff_HOST_REMOTE_1=`echo ${fileHOST} - ${file_REMOTE_HOST_1} | bc`
    diff_HOST_REMOTE_2=`echo ${fileHOST} - ${file_REMOTE_HOST_2} | bc`
    SLEEP=`echo "$SLEEP - 10" | bc`
  done

}
## Calling await_file_received
await_file_received