Extracting output from system(3) call

The C standard doesn't provide any way to do this, but your
implementation might. Try a system-specific newsgroup.

But first, please read <http://cfaj.freeshell. org/google/>.

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.

May 13 '06 #5

Martin Jørgensen

Robert Harris wrote:

v4vijayakumar wrote:
is there any standard way to extract output from system(3) function?
TIA.

<OT>
In a Posix system, use popen(3) instead
</OT>

BTW: What is Posix???
Best regards / Med venlig hilsen
Martin Jørgensen

--
---------------------------------------------------------------------------
Home of Martin Jørgensen - http://www.martinjoergensen.dk

May 13 '06 #6

SM Ryan

"v4vijayaku mar" <v4***********@ yahoo.com> wrote:
# is there any standard way to extract output from system(3) function?

You have to save the output to a file within the command line,
and then open the file subsequently.
For example on unix, you can do something like
if (system("cat gloober/* >fripper")!=0 ) error(...);
FILE *fripper = fopen("fripper" ,"r");
...
fclose(fripper) ;

POSIX systems also provide popen/pclose.
FILE *fripper = popen("cat gloober/*","r");
...
if (pclose(fripper )!=0) error(...);

--
SM Ryan http://www.rawbw.com/~wyrmwif/
But I do believe in this.

May 13 '06 #7

Mike Wahler

"Martin Jørgensen" <un*********@sp am.jay.net> wrote in message
news:08******** ****@news.tdc.d k...

Robert Harris wrote:
v4vijayakumar wrote:
is there any standard way to extract output from system(3) function?
TIA.

<OT>
In a Posix system, use popen(3) instead
</OT>

BTW: What is Posix???

http://en.wikipedia.org/wiki/POSIX

-Mike

May 13 '06 #8

v4vijayakumar

It seems that there is another way.

fclose (stdout);
stdout = fopen ("standard-output-file", "w");

system("ls");

/* process output file here */

May 15 '06 #9

Flash Gordon

v4vijayakumar wrote:

It seems that there is another way.
Another way to do what? Google is most definitely *not* Usenet, just an
interface that dupes people in to making incorrect assumptions. Read
http://clc-wiki.net/wiki/Intro_to_clc and provide context in future.
fclose (stdout);
stdout = fopen ("standard-output-file", "w");

system("ls");

/* process output file here */

I've got no idea what you think the above will do, but I doubt it will
actually do what you think. For a start, there is no guarantee that
changing stdout within a program will affect where the output of a
program invoked using system goes.
--
Flash Gordon, living in interesting times.
Web site - http://home.flash-gordon.me.uk/
comp.lang.c posting guidelines and intro:
http://clc-wiki.net/wiki/Intro_to_clc

May 15 '06 #10

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