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JVM Class Loading

Submitted by s10 on Tue, 02/03/2015 - 13:59

classloader	Configuration options	Jvm/jre
bootstrap	META-INF/manifest.mf Class-Path of above jars	JRE
extensions	System property: java.ext.dir. Default: $JAVA_HOME/jre/lib/ext META-INF/manifest.mf Class-Path of above jars

classloader

Configuration options

Jvm/jre

bootstrap

META-INF/manifest.mf Class-Path of above jars

JRE

extensions

System property: java.ext.dir. Default: $JAVA_HOME/jre/lib/ext

META-INF/manifest.mf Class-Path of above jars

how to split and join large files

Submitted by s10 on Fri, 04/03/2015 - 22:07

best and simplest way to split large file and join files

1. split large file in chunk of 1GB

split -b 1000m large.zip

above command will create files

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How to find empty directory and file

Submitted by Areefbuise on Mon, 11/10/2014 - 12:52

Find emtpy directory with -empty

# find . -type d -empty

Remove all empty directories

# find . -type d -empty -exec rmdir {} \;

Find all empty files

# find . -type f -empty

Find all non empty files

# find . -type f -not -empty

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citrix receiver error configuration manager cannot be initialized

Submitted by s10 on Tue, 05/13/2014 - 11:00

Citrix Receiver is getting an error "configuration manager cannot be initialized" when installing , re-installing on windows.

Follow these steps to cleanup the registery before installing citrix receiver:

1. Start->Run->regedit

2. Edit->Find the following text

9B123F490B54521479D0EDD389BCACC1

3. Right click and delete every occurance of this register

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Apple MAC change or switch java version

Submitted by s10 on Tue, 05/06/2014 - 12:14

By default JAVA is installed on mac at /System/Library/Java/JavaVirtualMachines

1. export JAVA_HOME and udpate PATH

host:~/Downloads

$ export JAVA_HOME=$(/usr/libexec/java_home -v 1.7) ; export PATH=$JAVA_HOME/bin:$PATH

2. Check Java version from commandline

host:~/Downloads

$ java -version

java version "1.7.0_17"

Java(TM) SE Runtime Environment (build 1.7.0_17-b02)

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openssh ssh public and private keys setup and permission

Submitted by s10 on Tue, 05/06/2014 - 10:37

In general one unix node can access another node, this can be configured using a common unix account on all the nodes with same username, password could be different on each machine, for security we prefer to keep access at user level on each node. Generally we provide sudo access for this user to higher level access on machines.