<s>
(	O
see	O
)	O
is	O
a	O
command-line	B-Application
utility	O
initially	O
written	O
for	O
use	O
with	O
the	O
Solaris	B-Application
7	I-Application
operating	O
system	O
in	O
1998	O
.	O
</s>
<s>
It	O
has	O
since	O
been	O
reimplemented	O
for	O
Linux	B-Application
and	O
some	O
BSDs	B-Operating_System
.	O
</s>
<s>
As	O
with	O
the	O
and	O
commands	O
,	O
is	O
used	O
to	O
send	O
signals	B-General_Concept
to	O
processes	B-Operating_System
.	O
</s>
<s>
The	O
command	B-Application
allows	O
the	O
use	O
of	O
extended	O
regular	B-Language
expression	I-Language
patterns	O
and	O
other	O
matching	O
criteria	O
.	O
</s>
<s>
Kill	B-Operating_System
the	O
most	O
recently	O
created	O
process	O
:	O
</s>
