<s>
In	O
computing	O
,	O
dir	B-Application
(	O
directory	B-Application
)	O
is	O
a	O
command	B-Application
in	O
various	O
computer	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
used	O
for	O
computer	B-Operating_System
file	I-Operating_System
and	O
directory	B-Application
listing	O
.	O
</s>
<s>
It	O
is	O
one	O
of	O
the	O
basic	O
commands	O
to	O
help	O
navigate	O
the	O
file	B-Application
system	I-Application
.	O
</s>
<s>
The	O
command	B-Application
is	O
usually	O
implemented	O
as	O
an	O
internal	O
command	B-Application
in	O
the	O
command-line	B-Application
interpreter	O
(	O
shell	B-Operating_System
)	O
.	O
</s>
<s>
On	O
some	O
systems	O
,	O
a	O
more	O
graphical	O
representation	O
of	O
the	O
directory	B-Application
structure	O
can	O
be	O
displayed	O
using	O
the	O
tree	B-Device
command	I-Device
.	O
</s>
<s>
The	O
command	B-Application
is	O
available	O
in	O
the	O
command-line	B-Application
interface	I-Application
(	O
CLI	O
)	O
of	O
the	O
operating	B-General_Concept
systems	I-General_Concept
Digital	B-Application
Research	I-Application
CP/M	I-Application
,	O
MP/M	B-Operating_System
,	O
Intel	O
ISIS-II	O
,	O
iRMX	B-Operating_System
86	I-Operating_System
,	O
Cromemco	O
CDOS	B-Operating_System
,	O
MetaComCo	B-Device
TRIPOS	B-Operating_System
,	O
DOS	B-Device
,	O
IBM/Toshiba	O
4690	B-Language
OS	I-Language
,	O
IBM	B-Application
OS/2	I-Application
,	O
Microsoft	B-Application
Windows	I-Application
,	O
Singularity	B-Operating_System
,	O
Datalight	O
ROM-DOS	B-Operating_System
,	O
ReactOS	B-Application
,	O
GNU	O
,	O
AROS	B-Application
and	O
in	O
the	O
DCL	B-Operating_System
command-line	B-Application
interface	I-Application
used	O
on	O
DEC	B-Operating_System
VMS	I-Operating_System
,	O
RT-11	B-Operating_System
and	O
RSX-11	B-Application
.	O
</s>
<s>
It	O
is	O
also	O
supplied	O
with	O
OS/8	B-Operating_System
as	O
a	O
CUSP	O
(	O
Commonly-Used	O
System	O
Program	O
)	O
.	O
</s>
<s>
The	O
dir	B-Application
command	B-Application
is	O
supported	O
by	O
Tim	O
Paterson	O
's	O
SCP	B-Operating_System
86-DOS	I-Operating_System
.	O
</s>
<s>
On	O
MS-DOS	B-Application
,	O
the	O
command	B-Application
is	O
available	O
in	O
versions	O
1	O
and	O
later	O
.	O
</s>
<s>
It	O
is	O
also	O
available	O
in	O
the	O
open	B-Application
source	I-Application
MS-DOS	B-Application
emulator	B-Application
DOSBox	B-Application
.	O
</s>
<s>
MS-DOS	B-Application
prompts	O
"	O
Abort	O
,	O
Retry	O
,	O
Fail	O
?	O
"	O
</s>
<s>
after	O
being	O
commanded	O
to	O
list	O
a	O
directory	B-Application
with	O
no	O
diskette	B-Device
in	O
the	O
drive	O
.	O
</s>
<s>
List	O
all	O
files	O
and	O
directories	B-Application
in	O
the	O
current	B-Application
working	I-Application
directory	I-Application
.	O
</s>
<s>
List	O
any	O
text	B-General_Concept
files	I-General_Concept
and	O
batch	O
files	O
(	O
filename	O
extension	O
"	O
.txt	B-General_Concept
"	O
or	O
"	O
.bat	O
"	O
)	O
.	O
</s>
<s>
Recursively	O
list	O
all	O
files	O
and	O
directories	B-Application
in	O
the	O
specified	O
directory	B-Application
and	O
any	O
subdirectories	B-Application
,	O
in	O
wide	O
format	O
,	O
pausing	O
after	O
each	O
screen	O
of	O
output	O
.	O
</s>
<s>
The	O
directory	B-Application
name	O
is	O
enclosed	O
in	O
double-quotes	O
,	O
to	O
prevent	O
it	O
from	O
being	O
interpreted	O
is	O
as	O
two	O
separate	O
command-line	B-Application
options	O
because	O
it	O
contains	O
a	O
whitespace	O
character	O
.	O
</s>
<s>
dir	B-Application
is	O
not	O
a	O
Unix	B-Application
command	B-Application
;	O
Unix	B-Application
has	O
the	O
analogous	O
ls	B-Application
command	B-Application
instead	O
.	O
</s>
<s>
The	O
GNU	O
operating	B-General_Concept
system	I-General_Concept
,	O
however	O
,	O
has	O
a	O
dir	B-Application
command	B-Application
that	O
"	O
is	O
equivalent	O
to	O
ls	B-Application
-C	O
-b	O
;	O
that	O
is	O
,	O
by	O
default	O
files	O
are	O
listed	O
in	O
columns	O
,	O
sorted	O
vertically	O
,	O
and	O
special	O
characters	O
are	O
represented	O
by	O
backslash	O
escape	O
sequences	O
"	O
.	O
</s>
<s>
Actually	O
,	O
for	O
compatibility	O
reasons	O
,	O
ls	B-Application
produces	O
device-dependent	O
output	O
.	O
</s>
<s>
The	O
dir	B-Application
instruction	O
,	O
unlike	O
ls	B-Application
-Cb	O
,	O
produces	O
device-independent	O
output	O
.	O
</s>
