<s>
In	O
computing	O
,	O
sleep	O
is	O
a	O
command	B-Application
in	O
Unix	B-Application
,	O
Unix-like	B-Operating_System
and	O
other	O
operating	B-General_Concept
systems	I-General_Concept
that	O
suspends	B-Operating_System
program	O
execution	O
for	O
a	O
specified	O
time	O
.	O
</s>
<s>
The	O
sleep	O
instruction	O
suspends	B-Operating_System
the	O
calling	O
process	B-Operating_System
for	O
at	O
least	O
the	O
specified	O
number	O
of	O
seconds	O
(	O
the	O
default	O
)	O
,	O
minutes	O
,	O
hours	O
or	O
days	O
.	O
</s>
<s>
for	O
Unix-like	B-Operating_System
systems	I-Operating_System
is	O
part	O
of	O
the	O
X/Open	O
Portability	O
Guide	O
since	O
issue	O
2	O
of	O
1987	O
.	O
</s>
<s>
It	O
was	O
inherited	O
into	O
the	O
first	O
version	O
of	O
POSIX	O
and	O
the	O
Single	O
Unix	B-Application
Specification	O
.	O
</s>
<s>
It	O
first	O
appeared	O
in	O
Version	B-Operating_System
4	I-Operating_System
Unix	I-Operating_System
.	O
</s>
<s>
The	O
version	O
of	O
sleep	O
bundled	O
in	O
GNU	B-Application
coreutils	I-Application
was	O
written	O
by	O
Jim	O
Meyering	O
and	O
Paul	O
Eggert	O
.	O
</s>
<s>
The	O
command	B-Application
is	O
also	O
available	O
in	O
the	O
OS-9	B-Operating_System
shell	O
,	O
in	O
the	O
KolibriOS	B-Operating_System
Shell	O
,	O
and	O
part	O
of	O
the	O
FreeDOS	B-Application
Package	O
group	O
Utilities	O
.	O
</s>
<s>
The	O
FreeDOS	B-Application
version	O
was	O
developed	O
by	O
Trane	O
Francks	O
and	O
is	O
licensed	O
under	O
the	O
GPL	B-License
.	O
</s>
<s>
A	O
sleep	O
command	B-Application
is	O
also	O
part	O
of	O
ASCII	O
's	O
MSX-DOS2	O
Tools	O
for	O
MSX-DOS	B-Operating_System
version	O
2	O
.	O
</s>
<s>
In	O
PowerShell	B-Application
,	O
sleep	O
is	O
a	O
predefined	O
command	B-Device
alias	I-Device
for	O
the	O
Start-Sleep	O
cmdlet	O
which	O
serves	O
the	O
same	O
purpose	O
.	O
</s>
<s>
Microsoft	O
also	O
provides	O
a	O
sleep	O
resource	O
kit	O
tool	O
for	O
Windows	B-Application
which	O
can	O
be	O
used	O
in	O
batch	O
files	O
or	O
the	O
command	B-Device
prompt	I-Device
to	O
pause	O
the	O
execution	O
and	O
wait	O
for	O
some	O
time	O
.	O
</s>
<s>
Another	O
native	B-Language
version	O
is	O
the	O
timeout	O
command	B-Application
which	O
is	O
part	O
of	O
current	O
versions	O
of	O
Windows	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	B-Operating_System
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>
<s>
Some	O
implementations	O
support	O
floating	B-Algorithm
point	I-Algorithm
numbers	I-Algorithm
.	O
</s>
<s>
However	O
,	O
sleep	O
5.5h	O
(	O
a	O
floating	B-Algorithm
point	I-Algorithm
)	O
is	O
allowed	O
.	O
</s>
<s>
The	B-Application
GNU	I-Application
Project	I-Application
's	O
implementation	O
of	O
sleep	O
(	O
part	O
of	O
coreutils	B-Application
)	O
allows	O
the	O
user	O
to	O
pass	O
an	O
arbitrary	O
floating	B-Algorithm
point	I-Algorithm
or	O
multiple	O
arguments	O
,	O
therefore	O
sleep	O
5h	O
30m	O
(	O
a	O
space	O
separating	O
hours	O
and	O
minutes	O
is	O
needed	O
)	O
will	O
work	O
on	O
any	O
system	O
which	O
uses	O
GNU	B-Operating_System
sleep	O
,	O
including	O
Linux	B-Application
.	O
</s>
<s>
Possible	O
uses	O
for	O
sleep	O
include	O
scheduling	O
tasks	O
and	O
delaying	O
execution	O
to	O
allow	O
a	O
process	B-Operating_System
to	O
start	O
,	O
or	O
waiting	O
until	O
a	O
shared	O
network	O
connection	O
most	O
likely	O
has	O
few	O
users	O
to	O
wget	B-Protocol
a	O
large	O
file	O
.	O
</s>
