Pretty easy, here you go:
sudo apt-get install openjdk-6-jdk
Default apt-get to yes
The problem with:
apt-get --yes install $something
is that it will ask for a manual confirmation if the package signature owner's public-key is not in the keyring, or some other conditions. to be sure it does not ask a confirmation just do this:
apt-get --yes --force-yes install $something
If you want to have these settings permanent, create a file in /etc/apt/apt.conf.d/, like /etc/apt/apt.conf.d/90forceyes with the following content:
APT::Get::Assume-Yes "true";
APT::Get::force-yes "true";
Install Guest Additions Fedora 18
1. $sudo yum update
Please reboot the system if you have just installed a new kernel.
Pre-Installation Setup
Before installing VirtualBox Linux Guest Additions, you need to install gcc, dkms and kernel development module. Use the following command:
2. $sudo yum install gcc kernel-devel dkms
Next you need to mount the Linux Guest Additions Image Disc. Under the VirtualBox menu bar, select Devices >> Install Guest Additions...
Click cancel if they ask if you want to run the disc image.
Install Linux Guest Additions
Once the disc image is mounted, use the following command (case sensitive):
3. $cd /run/media/$USER/VBOXADDITIONS*
4. $sudo ./VBoxLinuxAdditions.run
Adding users to sudoers
If there is a sudo group, you can do the following:
$sudo adduser <username> sudo
This works because /etc/sudoers is pre-configured to grant permissions to all members of this group (You should not have to make any changes to this):
# Allow members of group sudo to execute any command
%sudo ALL=(ALL:ALL) ALL
Otherwise, you can add the user directly
$nano /etc/sudoers
add the following to the end of the file, and save:
username ALL=(ALL) ALL
Quick SSH on Ubuntu 12.04
sudo apt-get install openssh-server
After the installation, you can SSH onto your machine, this is not secure and good for a home network solution, but you'll need to investigate security if you are going to hang the machine outside a Firewall.
Example of importing into your local Maven repository
You cannot get to some *.jar files remotely and you still need to build your project, you can use these commands to import into your local repository.
Example:
call mvn install:install-file -Dfile=/c/jars/ehcache-2.7.2.jar -DgroupId=net.sf.ehcache -DartifactId=ehcache -Dversion=2.7.2 -Dpackaging=jar
copy C:\jars\ehcache-2.7.2.jar C:\Users\userid\.m2\repository\net\sf\ehcache\ehcache\2.7.2\ehcache-2.7.2.jar.sha1
List files with complete path
$ls -d -1 $PWD/*.*
or as simple as
$ls -d -1 /my/other/path/*.*
Compare folders/files with diff Command
Use the following command, and the -q quiet parameter if you don't want the details
$diff -rq /wbi/webdev/cms /wbi/webtst/cms
Count of characters in a file
Count of all character, one per line
awk '{for(i=1;i<=NF;i++)if(!a[$i]++)print $i}' FS= *.xml
Count of all character, same line
awk '{for(i=1;i<=NF;i++)if(!a[$i]++)print $i}' ORS= FS= *.xml
Change your Unix prompt
export PS1="\n:whoami -> ${USER}@${HOSTNAME}\n:pwd -> ${PWD}\n:"
.bashrc
# User specific aliases and functions
### export PS1='\[\033[1m\][\u@\h \w]$ \[\033[m\] '
export PS1="\n:whoami -> ${USER}@${HOSTNAME}\n:pwd -> ${PWD}\n:"