<s>
is	O
a	O
command-line	B-Application
utility	O
on	O
a	O
number	O
of	O
computer	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
including	O
Unix	B-Application
,	O
Plan	B-Operating_System
9	I-Operating_System
,	O
Inferno	B-Operating_System
and	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
such	O
as	O
Linux	B-Application
that	O
prints	O
an	O
ASCII	B-Protocol
calendar	O
of	O
the	O
given	O
month	O
or	O
year	O
.	O
</s>
<s>
If	O
the	O
user	O
does	O
not	O
specify	O
any	O
command-line	B-Application
options	O
,	O
cal	B-Application
will	O
print	O
a	O
calendar	O
of	O
the	O
current	O
month	O
.	O
</s>
<s>
The	O
command	B-Application
is	O
a	O
standard	O
program	O
on	O
Unix	B-Application
and	O
specified	O
in	O
the	O
Single	O
UNIX	B-Application
Specification	O
.	O
</s>
<s>
The	O
cal	B-Application
command	B-Application
was	O
present	O
in	O
1st	B-Operating_System
Edition	I-Operating_System
Unix	I-Operating_System
.	O
</s>
<s>
A	O
cal	B-Application
command	B-Application
is	O
also	O
part	O
of	O
ASCII	B-Protocol
's	O
MSX-DOS2	O
Tools	O
for	O
MSX-DOS	B-Operating_System
version	O
2	O
.	O
</s>
<s>
It	O
is	O
also	O
available	O
for	O
FreeDOS	B-Application
.	O
</s>
<s>
The	O
FreeDOS	B-Application
version	O
was	O
developed	O
by	O
Charles	O
Dye	O
.	O
</s>
<s>
As	O
a	O
result	O
,	O
the	O
September	O
1752	O
cal	B-Application
shows	O
the	O
adjusted	O
days	O
missing	O
.	O
</s>
<s>
The	O
Plan	B-Operating_System
9	I-Operating_System
from	I-Operating_System
Bell	I-Operating_System
Labs	I-Operating_System
manual	O
states	O
:	O
"	O
Try	O
.	O
"	O
</s>
<s>
Special	O
handling	O
of	O
1752	O
is	O
known	O
to	O
have	O
appeared	O
as	O
early	O
as	O
the	O
first	O
edition	O
of	O
the	O
Unix	B-Application
Programmer	O
's	O
Manual	O
in	O
1971	O
.	O
</s>
