Page 133 - slides.dvi

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Unix
–
–
–
–
–
–
Case
can
ls
Most
ls
ls
sh
wc
Every
Actual
Pipeline
Study—
stdin:
Standard
Normally
build
stderr:
stdout:
file
is
Unix
Redirection
process
Processes
not
I/O
where
can
where
almost
better
where
has
to
<temp.txt
inherited
to
>temp.txt;
to
always
cause
commands
>listing.txt
(e.g.
<commands.sh.
>&listing.txt
read
three
from
send
send
are
ls
arbitrarily
fds
some
|
input
>results
on
parent,
wc
filters,
output.
appropriate;
from.
complex
but
i.e.
diagnostics.
buffering
e.g.
creation:
shell
read
>results)
command
from
allows
subtleties.
consider:
lines.
stdin
and
redirection
output
to/from
to
a
file,
stdout
⇒
e.g.:
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