yum-cron

You can configure cron to start yum command on daily basis to check for update. First install yum-cron command.

$ sudo yum install yum-cron

Installation will place 0yum.cron file under /etc/cron.daily directory. And cron executes yum-cron on daily basis.

You can control yum-cron’s behavior by modifying configuration file, /etc/sysconfig/yum-cron. I hereby quote some parameters in which you may be interested.

# Don't install, just check (valid: yes|no)
CHECK_ONLY=no

# Don't install, just check and download (valid: yes|no)
DOWNLOAD_ONLY=no

And start service for now. And configure system to start yum-cron service upon restart.

$ /etc/init.d/yum-cron start
$ sudo chkconfig yum-cron on

history

You can check if cron has started or not by referencing /var/log/cron* logs.

Aug 26 03:16:01 <hostname> run-parts(/etc/cron.daily)[24221]: starting 0yum.cron
Aug 26 04:07:46 <hostname> run-parts(/etc/cron.daily)[24421]: finished 0yum.cron

Log message are yielded in /var/log/yum.log file

Aug 09 04:09:11 Updated: nss-softokn-devel-3.14.3-3.el6_4.i686
Aug 09 04:09:12 Updated: nss-devel-3.14.3-4.el6_4.i686
Aug 09 04:09:13 Updated: nss-tools-3.14.3-4.el6_4.i686
Aug 14 03:36:46 Updated: httpd-tools-2.2.15-29.sl6.i686
Aug 14 03:36:48 Updated: httpd-2.2.15-29.sl6.i686

as specified in yum’s configuration file, /etc/yum.conf.

[main]
debuglevel=2
logfile=/var/log/yum.log

Or you can check history by yum history command.

$ sudo yum history
Loaded plugins: auto-update-debuginfo, downloadonly, fastestmirror, refresh-packagekit, security
ID     | Login user               | Date and time    | Action(s)      | Altered
-------------------------------------------------------------------------------
   138 | root <root>              | 2013-08-14 03:36 | Update         |    2
   137 | root <root>              | 2013-08-09 04:09 | Update         |   12
...

And You can check more details of update with “yum history <ID>”.

sigh

Ah...

By default, SL has similar functionality yum-autoupdate, which is enabled and executed on daily basis. So above configuration is duplicate and not necessary.

You can disable yum-autoupdate by configuring /etc/sysconfig/yum-autoupdate file.

ENABLED="false"

JVM

minecraft client is a jar file and you would better to have hotspot VM. You can install hotpost VM as follows:

$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
$ sudo apt-get install oracle-java7-installer

search path

As with default configuration shared object libjawt.so can not be found. You have to configure environment variable LD_LIBRARY_PATH so that libjawt.so can be searched for.

LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/jvm/java-7-oracle/jre/lib/i386/

key input

As ibus interrupts key input on minecraft and You can not input any word on minecraft. You can avoid this problem by configuring following environment variable:

XMODIFIERS=@im=none

script

Here is sample script to launch minecraft. If you would like to speak something upon start-up, please install TTS engine, festival.

#!/usr/bin/env bash

LANG=C
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/jvm/java-7-oracle/jre/lib/i386/
XMODIFIERS=@im=none
export LANG LD_LIBRARY_PATH XMODIFIERS

MINE_HOME=~/minecraft
cd $MINE_HOME

START_MSG="start minecraft"
echo $START_MSG|festival --tts

LOG=play.`date "+%Y%m%d"`.log

echo "START: " `date` >> $LOG
java -Xmx1024M -Xms512M -cp minecraft.jar net.minecraft.LauncherFrame >> $LOG 2>&1
echo "FINISH: " `date` >> $LOG

register unity panel

You can launch above script directly from unity panel.

• desktop file

Create desktop configuration file (e.g. minecraft.desktop) so that unity can evaluate how to launch application.

[Desktop Entry]
Type=Application
Terminal=false
Name=minecraft
Icon=/PATH_TO_ICON_DIR/minecraft.ico
Exec=/PATH_TO_SCRIPT_DIR/minecraft.sh

Put this desktop configuration file under /usr/share/applications directory.

• unity panel

And drag & drop this desktop configuration file onto unity panel.