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Shell Programming and Scripting
Run this grep every 10 minutes and do something based on the output
Post 302929529 by junior-helper on Monday 22nd of December 2014 12:19:21 PM
12-22-2014
It's simply a matter of taste. I used it to keep the terminal clean(er) 
Sometimes one just doesn't care about the output because we only rely on the exit status, like in this case.
Anyways, &>/dev/null is not mandatory here.
---------- Post updated at 07:19 PM ---------- Previous update was at 07:14 PM ----------
It covers standard error, too 
Sometimes one just doesn't care about the output because we only rely on the exit status, like in this case.
Anyways, &>/dev/null is not mandatory here.
---------- Post updated at 07:19 PM ---------- Previous update was at 07:14 PM ----------
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LEARN ABOUT CENTOS
rhn_register
RHN_REGISTER(8) Red Hat, Inc. RHN_REGISTER(8) NAME
rhn_register - Connect to Spacewalk Server, Red Hat Satellite or Red Hat Network Classic. SYNOPSIS
rhn_register [options] DESCRIPTION
rhn_register is a client program that registers your system with "Spacewalk Server", "Red Hat Satellite" or "Red Hat Network Classic". After registering, your system can receive software updates, install new software, and remotely manage your system. It can run both in graphical and text modes. OPTIONS
-v, --verbose Increase the debugging output. --proxy=PROXY Specify an http proxy to use. --proxyUser=PROXYUSER Specify a username to use for an authenticated proxy. This option must be used in conjunction with proxyPassword. --proxyPassword=PROXYPASSWORD Specify a password to use for an authenticated proxy. This option must be used in conjunction with proxyUser. --nox Run in text mode. --version Show the program's version number and exit. -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" or "Red Hat Satellite" or "Red Hat Network Classic". This file does not exist otherwise. /etc/sysconfig/rhn/up2date The common configuration file used by Red Hat client programs. SEE ALSO
rhn_check(8), rhnreg_ks(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 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 RHN_REGISTER(8)