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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

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

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

unix how to change file date and timestamp

Submitted by s10 on Thu, 06/12/2014 - 09:54

 

There are several several ways we can control the file timestamp on unix systems, touch command is useful to modify file to specific timestamp for:

1. access time

2. modified time

usage: touch option filename(s)

options:

-a = modify only access time

-m = modify only modified time

-r = reference copy the timestamp from file1 to file2

-d = add specifc timestamp to file

-t = add specific timestamp same as -d option but with different format 

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

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)

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.

Python HTTP Basic Authentication Program

Submitted by s10 on Tue, 01/28/2014 - 11:16

Python  HTTP Basic Authentication Program

 

 

New Line Characters at end of line

Submitted by s10 on Wed, 11/20/2013 - 16:37

$ awk '{sub("$","\r\n"); printf("

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