<s>
is	O
a	O
system	O
tool	O
available	O
on	O
some	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
.	O
</s>
<s>
When	O
invoked	O
with	O
an	O
additional	O
executable	O
command-line	O
argument	O
,	O
makes	O
it	O
possible	O
to	O
print	O
out	O
the	O
system	B-Operating_System
calls	I-Operating_System
made	O
by	O
and	O
the	O
signals	O
received	O
by	O
this	O
executable	O
command-line	O
argument	O
.	O
</s>
<s>
As	O
of	O
version	O
IEEE	O
Std	O
1003.1-2008	O
,	O
is	O
not	O
part	O
of	O
the	O
Single	O
UNIX	B-Application
Specification	O
(	O
POSIX	O
)	O
.	O
</s>
<s>
The	O
command	B-Application
was	O
originally	O
developed	O
by	O
Roger	O
Faulkner	O
and	O
Ron	O
Gomes	O
as	O
part	O
of	O
the	O
development	O
of	O
Procfs	B-Application
for	O
System	O
V	O
Release	O
4	O
.	O
</s>
