<s>
lsof	B-Device
is	O
a	O
command	O
meaning	O
"	O
list	O
open	O
files	O
"	O
,	O
which	O
is	O
used	O
in	O
many	O
Unix-like	B-Operating_System
systems	I-Operating_System
to	O
report	O
a	O
list	O
of	O
all	O
open	O
files	O
and	O
the	O
processes	O
that	O
opened	O
them	O
.	O
</s>
<s>
This	O
open	B-Application
source	I-Application
utility	O
was	O
developed	O
and	O
supported	O
by	O
Victor	O
A	O
.	O
Abell	O
,	O
the	O
retired	O
Associate	O
Director	O
of	O
the	O
Purdue	O
University	O
Computing	O
Center	O
.	O
</s>
<s>
A	O
replacement	O
for	O
Linux	B-Application
,	O
,	O
is	O
included	O
in	O
util-linux	B-Application
.	O
</s>
<s>
Its	O
man	B-Protocol
page	I-Protocol
says	O
:	O
"	O
ofiles	O
–	O
who	O
has	O
a	O
file	O
open	O
 [ ... ] 	O
displays	O
the	O
owner	O
and	O
id	B-Application
of	O
any	O
process	O
accessing	O
a	O
specified	O
device	O
"	O
.	O
</s>
<s>
Spencer	O
compiled	O
it	O
for	O
4.2BSD	O
and	O
ULTRIX	B-Operating_System
.	O
</s>
<s>
Moreover	O
,	O
in	O
the	O
newsgroup	B-Application
net.unix-wizards	O
,	O
he	O
further	O
remarks	O
:	O
</s>
<s>
Its	O
man	B-Protocol
page	I-Protocol
says	O
:	O
</s>
<s>
fstat	B-Language
identifies	O
open	O
files	O
.	O
</s>
<s>
options	O
are	O
specified	O
,	O
fstat	B-Language
reports	O
on	O
all	O
open	O
files	O
.	O
</s>
<s>
3.0.1[24]	O
for	O
Sequent	O
Symmetry	O
and	O
Balance	O
,	O
SunOS	B-Operating_System
4.0	O
and	O
ULTRIX	B-Operating_System
2.2	O
"	O
.	O
</s>
<s>
Fstat	B-Language
is	O
similar	O
to	O
the	O
ofiles	O
program	O
which	O
I	O
recently	O
submitted	O
.	O
</s>
<s>
ofiles	O
,	O
fstat	B-Language
identifies	O
open	O
files	O
.	O
</s>
<s>
In	O
1991	O
,	O
Vic	O
Abell	O
publishes	O
lsof	B-Device
version	O
1.0	O
to	O
comp.sources.unix	O
.	O
</s>
<s>
Thus	O
,	O
it	O
has	O
been	O
tested	O
on	O
AIX	B-Application
3.1	O
.	O
</s>
<s>
[357],	O
HP-UX	B-Application
[78].x,	O
</s>
<s>
NeXTStep	B-Application
2	O
.	O
</s>
<s>
[01],	O
Sequent	O
Dynix	B-Library
3.0.12	O
and	O
3.1.2	O
,	O
and	O
Sunos	B-Operating_System
4.1	I-Operating_System
and	O
4.1.1	O
.	O
</s>
<s>
In	O
2018	O
,	O
Vic	O
Abbell	O
publishes	O
lsof	B-Device
version	O
4.92	O
.	O
</s>
<s>
I	O
will	O
reach	O
80	O
years	O
of	O
age	O
later	O
this	O
year	O
and	O
I	O
think	O
it	O
's	O
time	O
for	O
me	O
to	O
end	O
my	O
work	O
on	O
general	O
lsof	B-Device
revision	O
releases	O
.	O
</s>
<s>
The	O
lsof	B-Device
code	O
is	O
put	O
on	O
Github	O
and	O
maintenance	O
is	O
transferred	O
.	O
</s>
<s>
Open	O
files	O
in	O
the	O
system	O
include	O
disk	O
files	O
,	O
named	B-Operating_System
pipes	I-Operating_System
,	O
network	B-Protocol
sockets	I-Protocol
and	O
devices	O
opened	O
by	O
all	O
processes	O
.	O
</s>
<s>
Lists	O
IP	B-Protocol
sockets	I-Protocol
.	O
</s>
<s>
One	O
can	O
also	O
list	O
Unix	O
Sockets	B-Protocol
by	O
using	O
lsof	B-Device
-U	O
.	O
</s>
<s>
The	O
lsof	B-Device
output	O
describes	O
:	O
</s>
