Perplexed

Why would I have a file, uniq the output, have the output redirected to a=
=20
file, and the file be blank when I tried to look at it?
--=20
:-)~Mike~(-:

[bmike1@localhost training]$ uniq test-sor
abc
1234
mary
75
About town

+abc
9
92 38
_ABC
abc
+777
ZZ
#ZZ

zz
my files
?453
?mary
abc
96
Mary
^Mary
[bmike1@localhost training]$ uniq test-sor >test-sor
[bmike1@localhost training]$ more test-sor
[bmike1@localhost training]$