$ ls .
file1  file2
$ ls . | head
file1
file2

$ ls
file1  file10  file11  file12  file13  file14  file15  file16  file17  file18  file19 file2  file3  file4  file5  file6  file7  file8  file9
$ ls -C . | head
file1 file11 file13 file15 file17 file19 file3  file5  file7  file9
file10 file12 file14 file16 file18 file2 file4  file6  file8

while [[ true ]] ; do ls ; done | uniq

while [[ true ]] ; do ls | tr 'n' ' ' ; done | uniq

ls | tr "n" " " | <whatever you like>

ls -w 10000 -C . | head

while true ; do echo * ; done | uniq

inotifywait -m . -e create,delete

import os
import time

last = set()
while True:
    cur = set(os.listdir('.'))
    added = cur-last
    removed = last-cur
    if added: print 'added', added
    if removed: print 'removed', removed
    last = set(os.listdir('.'))
    time.sleep(0.1)

ls | xargs