$ sudo apt-get install sun-java6-jdk

This command asks me the root password and then installs sun jdk and jre. I also need to change the PATH variable accordingly i.e.

$ vi ~/.bashrc
export JAVA_HOME=/usr/lib/jvm/java-6-sun

With the new installation of Ubuntu 10.04 LTS you need to do some modifications in /etc/apt/sources.list file to add a repository. Just try to search “canonical” and then uncomment two lines which looks like “deb http://archive.canonical.com/ lucid partner”

After that save the file and run following command to install Java:

$ sudo apt-get update

$ sudo apt-get install sun-java6-jdk

Alternatively you can also add partner repository by using following command as well:

$ sudo add-apt-repository "deb http://archive.canonical.com/ lucid  partner"

Another case may be when you need to move similar files to some other location. Example is moving same day files or same extention files to some other location. I am here trying to list some of the unix commonds which can be useful for doing file moving activity.

1. Moving files older than certain time (older than yesterday in following example).

#find -mtime +1 -exec mv "{}" /destincation_folder 

2. Moving file date wise (All yesterday files)

#find -mtime 1 -daystart -exec mv "{}" /destincation_folder 

Another way to do is finding all files of specific date and then iterating over them to copy into any other folder

ls -la | awk '{ print $8}' > filenames

Shell script to iterate all files

#!/bin/sh
list=` cat filenames`

for i in $list; do
echo $i
mv $i /someDIR

done
exit

3. Moving files in chunk (e.g moving 10000 files in one go)

#ls -la | tail 10000 | xargs mv /destination_folder

We were some of the things which made above situation for us:

1. Taking backups of DB and not cleaning up.
2. File storage server was running on the same server without any cleanup policy.

We did not realize that these two can eat up all the disk so quickly and learnt our lesson.

Avoid things like these and it is better if you configure daily disk stats in your mail box for all production servers.