05-22-2009
How to read output of a shell command
Hello All,
I have a an application written in C and runing on Red Hat Linux.
In my code I have written a command that is fired on the linux shell by using system() function call.
Now I need to read the output of this command in my c program and assign it to a variable.
Can anyone please tell how do i do so ?
Thanks and Regards,
Shamik.
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LEARN ABOUT CENTOS
rhnreg_ks
RHNREG_KS(8) Red Hat, Inc. RHNREG_KS(8)
NAME
rhnreg_ks - A program for non interactively registering systems to Spacewalk Server, Red Hat Satellite or Red Hat Network Classic.
SYNOPSIS
rhnreg_ks [options]
DESCRIPTION
rhnreg_ks is a utility for registering a system with the "Spacewalk Server", "Red Hat Satellite" or "Red Hat Network Classic". It is
designed to be used in a non-interactive environment (a kickstart style install, for example). All the information can be specified on
the command line or stdin.
OPTIONS
--profilename
Specify the profile name that should be used as an identifier for the system in Spacewalk Server, Red Hat Satellite or Red Hat Net-
work Classic
--username
The username to register the system with under Spacewalk Server, Red Hat Satellite or Red Hat Network Classic. This can be an exist-
ing Spacewalk, Red Hat Satellite or Red Hat Network Classic username, or a new username.
--password
The password associated with the username specified with the --username option. This is an unencrypted password.
--activationkey
Specify/use a serial number to associate with the system. This is optional, but activation keys can really simplify the registration
process. Learn more about activation keys in the online RHN documentation.
--contactinfo
This option has been deprecated. Please login to the server web user interface and update your contactinfo.
--nohardware
Do not probe or upload any hardware information.
--nopackages
Do not profile or upload any package information.
--novirtinfo
Do not profile or upload any virtualization information.
--norhnsd
Do not start rhnsd after completion.
--force
Register the system even if it has already been registered.
--version
Show the version of rhnreg_ks.
--proxy
Specify a HTTP proxy to use.
--proxyUser
Specify a username to use with an authenticated HTTP proxy.
--proxyPassword
Specify a password to use with an authenticated HTTP proxy.
--sslCACert
Specify a path to a SSL CA certificate to use.
--serverUrl
Specify a URL to as the server.
-h, --help
Show a help message and exit.
FILES
/etc/sysconfig/rhn/systemid
The digital server ID for this machine if the system has been registered onto "Spacewalk Server", "Red Hat Satellite" or "Red Hat
Network Classic". This file does not exist otherwise.
/etc/sysconfig/rhn/up2date
The common configuration file used by RHN client programs.
EXAMPLES
Register a new system to Spacewalk / Red Hat Satellite / Red Hat Network Classic:
rhnreg_ks --profilename "example_profile_name" --username "someexampleuser" --password "foobar"
SEE ALSO
rhn_check(8), rhn_register(8), rhnsd(8), rhn-profile-sync(8), rhnplugin(8), up2date(5).
AUTHORS
See the AUTHORS file included with this software.
This manual page was written by Adrian Likins <alikins@redhat.com> and James Bowes <jbowes@redhat.com>
BUGS
Report bugs to <http://bugzilla.redhat.com>.
COPYRIGHT
Copyright (C) 1999-2011 Red Hat, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
Linux 2011 February 4 RHNREG_KS(8)