<s>
EXEC	B-Application
2	I-Application
is	O
an	O
interpreted	O
,	O
command	O
procedure	O
control	O
,	O
computer	O
scripting	B-Language
language	I-Language
used	O
by	O
the	O
EXEC	B-Application
2	I-Application
Processor	O
originally	O
supplied	O
with	O
the	O
CMS	B-Operating_System
component	O
of	O
the	O
IBM	O
Virtual	O
Machine/System	O
Product	O
(	O
VM/SP	B-Application
)	O
operating	O
system	O
.	O
</s>
<s>
EXEC	B-Application
2	I-Application
is	O
mostly	O
compatible	O
with	O
CMS	B-Application
EXEC	I-Application
but	O
EXEC	B-Application
2	I-Application
scripts	O
must	O
begin	O
with	O
an	O
&	O
TRACE	O
statement	O
.	O
</s>
<s>
Some	O
EXEC	B-Application
statements	O
and	O
predefined	O
variables	O
do	O
not	O
exist	O
in	O
EXEC	B-Application
2	I-Application
,	O
although	O
in	O
some	O
cases	O
there	O
are	O
analogs	O
.	O
</s>
<s>
EXEC	B-Application
2	I-Application
has	O
the	O
following	O
enhancements	O
:	O
</s>
<s>
EXEC	B-Application
2	I-Application
can	O
issue	O
commands	O
to	O
subcommand	O
environments	O
as	O
well	O
as	O
CMS	B-Operating_System
and	O
CP	O
.	O
</s>
<s>
EXEC	B-Application
2	I-Application
has	O
additional	O
built-in	O
functions	O
.	O
</s>
<s>
EXEC	B-Application
2	I-Application
has	O
user-defined	O
functions	O
.	O
</s>
<s>
EXEC	B-Application
2	I-Application
commands	O
may	O
include	O
subroutines	O
and	O
functions	O
.	O
</s>
<s>
EXEC	B-Application
2	I-Application
has	O
extra	O
debugging	O
facilities	O
.	O
</s>
<s>
CMS	B-Operating_System
programs	O
can	O
manipulate	O
EXEC	B-Application
2	I-Application
variables	O
.	O
</s>
<s>
Some	O
statemts	O
of	O
EXEC	B-Application
are	O
not	O
supported	O
in	O
EXEC	B-Application
2	I-Application
,	O
including	O
:	O
</s>
<s>
Some	O
predefined	O
variables	O
of	O
EXEC	B-Application
are	O
not	O
defined	O
in	O
EXEC2	B-Application
:	O
</s>
<s>
written	O
using	O
the	O
syntax	O
of	O
CMS	B-Application
EXEC	I-Application
,	O
EXEC	B-Application
2	I-Application
or	O
REXX	B-Language
.	O
</s>
<s>
files	O
,	O
they	O
begin	O
with	O
a	O
"	O
&	O
TRACE	O
"	O
statement	O
,	O
to	O
distinguish	O
them	O
from	O
CMS	B-Application
EXEC	I-Application
files	O
.	O
</s>
<s>
Written	O
in	O
the	O
1970s	O
and	O
formally	O
introduced	O
for	O
CMS	B-Operating_System
with	O
VM/SP	B-Application
Release	O
1	O
,	O
EXEC	B-Application
2	I-Application
was	O
preceded	O
by	O
CMS	B-Application
EXEC	I-Application
and	O
superseded	O
by	O
REXX	B-Language
.	O
</s>
<s>
All	O
three	O
command	O
interpreters	O
—	O
CMS	B-Application
EXEC	I-Application
,	O
EXEC	B-Application
2	I-Application
and	O
REXX	B-Language
—	O
continue	O
to	O
be	O
supported	O
by	O
z/VM	B-Application
.	O
</s>
