<s>
getty	B-Device
,	O
short	O
for	O
"	O
get	O
tty	O
"	O
,	O
is	O
a	O
Unix	B-Application
program	O
running	O
on	O
a	O
host	B-Device
computer	I-Device
that	O
manages	O
physical	O
or	O
virtual	O
terminals	O
(	O
TTYs	O
)	O
.	O
</s>
<s>
When	O
it	O
detects	O
a	O
connection	O
,	O
it	O
prompts	O
for	O
a	O
username	O
and	O
runs	O
the	O
'	O
login	B-General_Concept
 '	O
program	O
to	O
authenticate	O
the	O
user	O
.	O
</s>
<s>
Originally	O
,	O
on	O
traditional	B-Application
Unix	I-Application
systems	O
,	O
getty	B-Device
handled	O
connections	O
to	O
serial	B-General_Concept
terminals	I-General_Concept
(	O
often	O
Teletype	O
machines	O
)	O
connected	O
to	O
a	O
host	B-Device
computer	I-Device
.	O
</s>
<s>
The	O
tty	O
part	O
of	O
the	O
name	O
stands	O
for	O
Teletype	O
,	O
but	O
has	O
come	O
to	O
mean	O
any	O
type	O
of	O
text	O
terminal	B-General_Concept
.	O
</s>
<s>
One	O
getty	B-Device
process	I-Device
serves	O
one	O
terminal	B-General_Concept
.	O
</s>
<s>
In	O
some	O
systems	O
,	O
for	O
example	O
,	O
Solaris	B-Application
,	O
getty	B-Device
was	O
replaced	O
by	O
ttymon	O
.	O
</s>
<s>
Personal	B-Device
computers	I-Device
running	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
,	O
even	O
if	O
they	O
do	O
not	O
provide	O
any	O
remote	O
login	B-General_Concept
services	O
,	O
may	O
still	O
use	O
getty	B-Device
as	O
a	O
means	O
of	O
logging	O
in	O
on	O
a	O
local	O
virtual	B-Application
console	I-Application
.	O
</s>
<s>
Instead	O
of	O
the	O
login	B-General_Concept
program	O
,	O
getty	B-Device
may	O
also	O
be	O
set	O
up	O
by	O
the	O
system	B-Application
administrator	I-Application
to	O
run	O
any	O
other	O
program	O
,	O
for	O
example	O
pppd	O
(	O
point-to-point	B-Protocol
protocol	I-Protocol
daemon	B-Operating_System
)	O
to	O
provide	O
a	O
dial-up	O
Internet	O
connection	O
.	O
</s>
