FINAL
TRIM
SIZE
:
7.0
in
x
8.5
in
Glossary
system.
See
Shel
ls:
User's
Guide
for
information
on
the
c
haracteristics
of
the
v
arious
shells.
shell
script
A
le
that
con
tains
commands
that
a
shell
can
in
terpret
and
run.
Also
\shell
program."
sh
ut
do
wn
T
o
take
the
system
from
m
ulti-user
state
to
a
state
in
whic
h
no
pro cesses
are
running,
using
the
shutdown
command.
single-user
state
The
state
of
a
computer
where
there
is
little
or
no
pro cess
activity
and
no
users
logged
in.
The
system
is
only
accessible
to
the
curren
t
system
administrator
(ro
ot).
This
mo
de
is
brough
t
ab out
b
y
execution
of
shutdown
(1).
Also
called
single-user
mo
de.
SPU
System
Pro
cessing
Unit.
The
instruction-pro
cessing
mo
dule
of
the
computer.
standard
error
The
destination
of
error
and
sp ecial
messages
from
a
program,
in
tended
to
b e
used
for
diagnostic
messages.
The
standard
error
output
is
often
called
stderr ,
and
is
automatically
op ened
b
y
the
shell
for
writing
on
le
descriptor
2
for
ev
ery
command
in
v
ok
ed.
Standard
error
usually
app ears
on
the
display
unless
it
is
directed
otherwise.
standard
input
The
source
of
input
data
for
a
program.
The
standard
input
le
is
often
called
stdin,
and
is
automatically
op ened
b
y
the
shell
for
reading
on
le
descriptor
0
for
ev
ery
command
in
v
ok
ed.
standard
output
The
destination
of
output
data
from
a
program.
Standard
output
app ears
on
the
display
unless
it
is
redirected
otherwise.
su
Sup er
User.
Se
e
ro ot
user
.
DRAFT
2/5/97
11:31
Glossary-9
