<s>
The	O
command	B-Application
,	O
an	O
abbreviation	O
of	O
change	O
owner	O
,	O
is	O
used	O
on	O
Unix	B-Application
and	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
to	O
change	O
the	O
owner	O
of	O
file	O
system	O
files	B-Operating_System
,	O
directories	B-Application
.	O
</s>
<s>
The	O
command	B-Application
is	O
available	O
as	O
a	O
separate	O
package	O
for	O
Microsoft	B-Application
Windows	I-Application
as	O
part	O
of	O
the	O
UnxUtils	B-Application
collection	O
of	O
native	B-Language
Win32	B-Library
ports	O
of	O
common	O
GNU	O
Unix-like	B-Operating_System
utilities	O
.	O
</s>
<s>
The	O
command	B-Application
has	O
also	O
been	O
ported	O
to	O
the	O
IBM	B-Application
i	I-Application
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
