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PDSH (Parallel Distributed SHell) issues commands to groups of hosts in parallel. It is a rewrite of IBM's dsh implementation done at LLNL.

pdsh is a variant of the rsh(1) command. Unlike rsh(1), which runs commands on a single remote host, pdsh can run multiple remote commands in parallel. pdsh uses a "sliding window" (or fanout) of threads to conserve resources on the initiating host while allowing some connections to time out.

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SMART basics

SMART is the abbreviation for "Self Monitoring And Reporting Technology". It is a standard interface protocol and set of the disk features that allows disk to check its status and report it to a host system. SMART information consists of "attributes", each one describing some particular aspect of drive condition. Some attributes may be designated "life-critical", which implies that the corresponding parameters are more important than other ones.

Three values are associated with ...

To make an ISO from your CD/DVD, place the media in your drive but do not mount it. If it automounts, unmount it.

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dd if=/dev/dvd of=dvd.iso # for dvd
dd if=/dev/cdrom of=cd.iso # for cdrom
dd if=/dev/scd0 of=cd.iso # if cdrom is scsi


To make an ISO from files on your hard drive, create a directory which holds the files you want. Then use the mkisofs command.

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mkisofs -o /tmp/cd.iso /tmp/directory/

This results in ...

Common vi commands

As the name implies, rpm2cpio takes an RPM package file and converts it to a cpio archive. Because it's written to be used primarily as a filter, there's not much to be specified. rpm2cpio takes only only one argument.

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rpm2cpio php-pdo-5.1.6-24.el5_4.5.i386.rpm| cpio -idmv

./etc/php.d/pdo.ini
./etc/php.d/pdo_sqlite.ini
./usr/lib/php/modules/pdo.so
./usr/lib/php/modules/pdo_sqlite.so
202 blocks

Output of rpm2cpio piped to cpio command with following options:
i: Restore archive
d: Create leading directories where needed
m: Retain previous file modification times when ...

Download the Storage Manager RPM for your card model and architecture from the official site http://www.adaptec.com/en-US/support/raid/.
If you run /usr/StorMan/arcconf and get this error:

./arcconf: error while loading shared libraries: libstdc++.so.5: cannot open shared object file: No such file or directory

You need to preload additional library:

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export LD_PRELOAD="/usr/StorMan/libstdc++.so.5"

Help information can be obtained with the help of the following command:

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/usr/StorMan/arcconf

| UCLI | Adaptec uniform command line interface
| UCLI | ...

You can insert following code to simplify cron times edit:
# .---------------- minute (0 - 59)
# | .------------- hour (0 - 23)
# | | .---------- day of month (1 - 31)
# | | | .------- month (1 - 12) OR jan,feb,mar,apr ...
# | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# | | | | |
# * * * * * command ...

How to update Centos4 to Centos5 without complete OS reload/re-setup

1. First of all we need to ensure that we have the latest Centos4 system:

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yum -y update

2. Make sure you disable all other repos and only have CentOS Base and Updates repositories enabled. It will require a bit more manual steps to perform an update in case other (non-default ones) repos were in use.

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cd/etc/yum.repos.d/

/etc/yum.repos.d/CentOS-Base.repo :
# CentOS-Base.repo
#
# The mirror ...

Force fsck on boot using /forcefsck

By creating /forcefsck file you will force the Linux system (or rc scripts) to perform a full file system check.

Login as the root. Create a file called forcefsck:

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touch /forcefsck

Now reboot the system:

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reboot

Force fsck on next boot using shutdown command

The -F option force fsck on reboot, login as root and type the following command to reboot and run fsck:

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shutdown -rF now

Install FFMPEG FFMPEG-PHP on Centos

Recently it became available to use binary packages for FFmpeg and other related codecs for media content management without need to compile all of them from the sources. Here is an instruction and packages set. Enjoy.

Enable RPMforge repos:

http://wiki.centos.org/AdditionalResour ... s/RPMForge
i386:

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wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.i386.rpm
rpm -ivh rpmforge-release-0.5.2-2.el5.rf.i386.rpm

x86_64

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wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.x86_64.rpm
rpm -ivh rpmforge-release-0.5.2-2.el5.rf.x86_64.rpm

Installing packages:
yum install yasm faad2 faad2-devel opencore-amr opencore-amr-devel libtheora ...