<s>
The	O
Unix	B-Application
command	B-Application
fuser	B-Device
is	O
used	O
to	O
show	O
which	O
processes	O
are	O
using	O
a	O
specified	O
computer	B-Operating_System
file	I-Operating_System
,	O
file	B-Application
system	I-Application
,	O
or	O
Unix	B-Protocol
socket	I-Protocol
.	O
</s>
<s>
For	O
example	O
,	O
to	O
check	O
process	B-Operating_System
IDs	I-Operating_System
and	O
users	O
accessing	O
a	O
USB	O
drive	O
:	O
</s>
<s>
This	O
makes	O
it	O
easier	O
to	O
process	B-Operating_System
the	O
output	O
with	O
computer	O
programs	O
.	O
</s>
<s>
The	O
command	B-Application
can	O
also	O
be	O
used	O
to	O
check	O
what	O
processes	O
are	O
using	O
a	O
network	O
port	O
:	O
</s>
<s>
If	O
at	O
least	O
one	O
access	O
has	O
succeeded	O
,	O
fuser	B-Device
returns	O
zero	O
.	O
</s>
<s>
The	O
output	O
of	O
"	O
fuser	B-Device
"	O
may	O
be	O
useful	O
in	O
diagnosing	O
"	O
resource	O
busy	O
"	O
messages	O
arising	O
when	O
attempting	O
to	O
unmount	B-Application
filesystems	B-Application
.	O
</s>
<s>
-k	O
,	O
--kill	O
Kill	O
all	O
processes	O
accessing	O
a	O
file	O
by	O
sending	O
a	O
SIGKILL	B-General_Concept
.	O
</s>
<s>
-HUP	O
or	O
-1	O
to	O
send	O
a	O
different	O
signal	B-Operating_System
.	O
</s>
<s>
-l	O
,	O
--list-signals	O
List	O
all	O
supported	O
signal	B-Operating_System
names	O
.	O
</s>
<s>
-i	O
,	O
--interactive	O
Prompt	O
before	O
killing	O
a	O
process	B-Operating_System
.	O
</s>
<s>
Without	O
this	O
option	O
,	O
only	O
files	O
accessed	O
by	O
at	O
least	O
one	O
process	B-Operating_System
are	O
shown	O
.	O
</s>
<s>
-m	O
,	O
--mount	O
Same	O
as	O
-c	O
.	O
Treat	O
all	O
following	O
path	O
names	O
as	O
files	O
on	O
a	O
mounted	B-Application
file	B-Application
system	I-Application
or	O
block	O
device	O
.	O
</s>
<s>
All	O
processes	O
accessing	O
files	O
on	O
that	O
file	B-Application
system	I-Application
are	O
listed	O
.	O
</s>
<s>
The	O
list	O
of	O
all	O
open	O
files	O
and	O
the	O
processes	O
that	O
have	O
them	O
open	O
can	O
be	O
obtained	O
through	O
the	O
lsof	B-Device
command	B-Application
.	O
</s>
<s>
The	O
equivalent	O
command	B-Application
on	O
BSD	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
is	O
.	O
</s>
