<s>
The	O
computer	O
program	O
par	B-Device
is	O
a	O
text	O
formatting	O
utility	O
for	O
Unix	B-Application
and	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
,	O
written	O
by	O
Adam	O
M	O
.	O
Costello	O
as	O
a	O
replacement	O
for	O
the	O
fmt	B-Application
command	B-Application
.	O
</s>
<s>
Par	B-Device
reformats	O
paragraphs	O
of	O
text	O
to	O
fit	O
into	O
a	O
given	O
line	O
length	O
optimally	O
,	O
keeping	O
prefixes	O
and	O
suffixes	O
intact	O
,	O
which	O
is	O
useful	O
for	O
formatting	O
source	O
code	O
comments	O
.	O
</s>
<s>
Par	B-Device
can	O
be	O
invoked	O
from	O
text	O
editors	O
such	O
as	O
Vim	B-Application
or	O
Emacs	B-Application
.	O
</s>
<s>
To	O
support	O
Unicode	O
par	B-Device
needs	O
to	O
be	O
compiled	O
with	O
a	O
patch	B-Application
that	O
adds	O
multi-byte	O
character	O
support	O
,	O
typically	O
,	O
UTF-8	O
encoding	O
.	O
</s>
<s>
Unlike	O
fmt	B-Application
,	O
par	B-Device
also	O
supports	O
text	O
justification	O
.	O
</s>
