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Home -> Community -> Mailing Lists -> Oracle-L -> RE: shell and output redirection
At what context do you execute this below? =20
Inside a shell script or perl program?
I can do it in perl by generating the output file and then ask perl to =
execute the output file using system or the quote mark.
This is clever. I used pipe all the time filtering data but not to this =
extent.
Thanks for the tip.
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Mladen Gogala
Sent: Friday, July 02, 2004 3:24 PM
To: oracle-l_at_freelists.org
Subject: Re: shell and output redirection
On 07/02/2004 02:57:21 PM, Ganesh.Raja_at_barclayscapital.com wrote:
> They are Not Run ||'el... The utput of the first program is stored =
before
> the second is executed...
Not true. Here is the trace:
read(0, "l", 1) =3D 1
write(2, "l", 1) =3D 1
rt_sigprocmask(SIG_BLOCK, NULL, [RTMIN], 8) =3D 0
read(0, "s", 1) =3D 1
write(2, "s", 1) =3D 1
rt_sigprocmask(SIG_BLOCK, NULL, [RTMIN], 8) =3D 0
read(0, "|", 1) =3D 1
write(2, "|", 1) =3D 1
rt_sigprocmask(SIG_BLOCK, NULL, [RTMIN], 8) =3D 0
read(0, "s", 1) =3D 1
write(2, "s", 1) =3D 1
rt_sigprocmask(SIG_BLOCK, NULL, [RTMIN], 8) =3D 0
read(0, "o", 1) =3D 1
write(2, "o", 1) =3D 1
rt_sigprocmask(SIG_BLOCK, NULL, [RTMIN], 8) =3D 0
read(0, "e", 1) =3D 1
write(2, "e", 1) =3D 1
rt_sigprocmask(SIG_BLOCK, NULL, [RTMIN], 8) =3D 0
read(0, "\10", 1) =3D 1
write(2, "\10 \10", 3) =3D 3
rt_sigprocmask(SIG_BLOCK, NULL, [RTMIN], 8) =3D 0
read(0, "e", 1) =3D 1
write(2, "e", 1) =3D 1
rt_sigprocmask(SIG_BLOCK, NULL, [RTMIN], 8) =3D 0
read(0, "\10", 1) =3D 1
write(2, "\10 \10", 3) =3D 3
rt_sigprocmask(SIG_BLOCK, NULL, [RTMIN], 8) =3D 0
read(0, "r", 1) =3D 1
rt_sigprocmask(SIG_BLOCK, ~[], [RTMIN], 8) =3D 0
rt_sigprocmask(SIG_SETMASK, [RTMIN], NULL, 8) =3D 0
write(2, "r", 1) =3D 1
rt_sigprocmask(SIG_BLOCK, NULL, [RTMIN], 8) =3D 0
read(0, "t", 1) =3D 1
write(2, "t", 1) =3D 1
rt_sigprocmask(SIG_BLOCK, NULL, [RTMIN], 8) =3D 0
read(0, "\r", 1) =3D 1
write(2, "\n", 1) =3D 1
/* Read "ls|sort" from terminal screen */
pipe([3, 4]) =3D 0
rt_sigprocmask(SIG_BLOCK, [INT CHLD], [CHLD RTMIN], 8) =3D 0
pipe([5, 6]) =3D 0
fork() =3D 9430
setpgid(9430, 9430) =3D 0
rt_sigprocmask(SIG_SETMASK, [CHLD RTMIN], NULL, 8) =3D 0
close(4) =3D 0
close(4) =3D -1 EBADF (Bad file descriptor)
rt_sigprocmask(SIG_BLOCK, [INT CHLD], [CHLD RTMIN], 8) =3D 0
fork() =3D 9431
/* Create two pipes and fork two processes */
wait4(-1, [WIFEXITED(s) && WEXITSTATUS(s) =3D=3D 0], 0, NULL) =3D 9429 /* Wait for the output. Exec calls in the 2 forked processes weren't = visible */
--=20
Mladen Gogala
Oracle DBA
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