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Thanks only tr -d '\t' works others dont.

This works for me

#!/bin/bash
args=("$@")
INDEX=0
touch sorterfile
if [ -z $args ]; then
echo "Error"
else
while [ $# -gt $INDEX ]; do
NUM=${args[$INDEX]}
echo $NUM
echo ./sorter $NUM >>...

if you are on linux it support mult file tail

tail -f filename -f filename

Or use the below script.

#!/bin/sh

trap 'kill $(jobs -p)' EXIT

for file in "$@"
do

tail -f $file &
done...

No & does move the job to next line

Use this command this is the fastest , even faster than find.

ls -lR . | egrep -c '^-'

The reason for difference is output in find and ls is ignoring hidden files.

Very well explained , top notch