<s>
In	O
Unix	B-Application
and	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
,	O
is	O
a	O
utility	B-Application
used	O
to	O
send	B-Application
messages	I-Application
to	O
another	O
user	O
by	O
writing	O
a	O
message	O
directly	O
to	O
another	O
user	O
's	O
TTY	B-Device
.	O
</s>
<s>
The	O
write	O
command	B-Application
was	O
included	O
in	O
the	O
First	O
Edition	O
of	O
the	O
Research	B-Operating_System
Unix	I-Operating_System
operating	O
system	O
.	O
</s>
<s>
A	O
similar	O
command	B-Application
appeared	O
in	O
Compatible	B-Operating_System
Time-Sharing	I-Operating_System
System	I-Operating_System
.	O
</s>
<s>
The	O
syntax	O
for	O
the	O
write	O
command	B-Application
is	O
:	O
</s>
<s>
The	O
write	O
session	O
is	O
terminated	O
by	O
sending	O
EOF	B-Language
,	O
which	O
can	O
be	O
done	O
by	O
pressing	O
Ctrl+D	O
.	O
</s>
<s>
The	O
tty	B-Device
argument	O
is	O
only	O
necessary	O
when	O
a	O
user	O
is	O
logged	O
into	O
more	O
than	O
one	O
terminal	O
.	O
</s>
