<s>
freedup	B-Language
is	O
a	O
program	B-Application
to	O
scan	O
directories	B-Application
or	O
file	O
lists	O
for	O
duplicate	O
files	B-Operating_System
.	O
</s>
<s>
The	O
file	O
lists	O
may	O
be	O
provided	O
to	O
an	O
input	B-Operating_System
pipe	I-Operating_System
or	O
internally	O
generated	O
using	O
find	B-Application
with	O
provided	O
options	O
.	O
</s>
<s>
freedup	B-Language
first	O
compares	O
file	O
sizes	O
,	O
then	O
on	O
equal	O
sizes	O
the	O
MD5	B-Algorithm
signatures	I-Algorithm
,	O
and	O
before	O
taking	O
actions	O
a	O
byte-by-byte	O
check	O
for	O
verification	O
is	O
performed	O
.	O
</s>
<s>
An	O
interactive	O
mode	O
allows	O
to	O
decide	O
individually	O
which	O
files	B-Operating_System
to	O
link	B-Application
soft	I-Application
or	O
hard	B-Application
or	O
to	O
delete	O
.	O
</s>
<s>
The	O
comparison	O
by	O
ignoring	O
tags	O
and	O
comments	O
is	O
a	O
unique	O
feature	O
of	O
freedup	B-Language
.	O
</s>
<s>
An	O
auto-Mode	O
is	O
supported	O
to	O
instruct	O
freedup	B-Language
to	O
ignore	O
all	O
tags	O
that	O
are	O
recognized	O
.	O
</s>
<s>
freedup	B-Language
is	O
written	O
in	O
POSIX	O
compliant	O
C	B-Language
and	O
is	O
released	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
This	O
is	O
done	O
for	O
equally	O
long	O
files	B-Operating_System
after	O
sorting	O
according	O
to	O
filesize	O
using	O
qsort( )	O
.	O
</s>
