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To set them, export VAR=1 To check them, printenv To unset, unset VAR. On Ubuntu, you can set vim ~/.pam_environment and then write: JAVA_HOME=/usr/local/bin/jdk1.6.0_30 PATH DEFAULT=${PATH}:${JAVA_HOME}/bin Or, you can go to ~/ .bashrc and write: export JAVA_HOME="/usr/local/bin/jdk1.6.0_30" export PATH=$PATH:$JAVA_HOME/bin

Vim keeps messing up your pastes. Type :set paste Pasting it now works. Once done, you can type :set nopaste Thanks to http://www.protocolostomy.com/2008/04/04/vim-messing-up-indentation-on-your-pasted-code/

Do a 'git status' in the directory you are concerned with. This will give you the list of files that have changed. Then you can do:  'git diff filename.java > changes.patch' This creates the patch file!

So I was adding my driver to the Linux kernel. Made a new Kconfig file and added 'menu' and 'endmenu' sections. But when I compiled the kernel I got an error saying 'endmenu in different file than menu'. Reason: There has to be a new line character after endmenu in your Kconfig file!

Thought it would be simple, but apparently not. These are the instructions I followed first and the installer seemed to get stuck at 99% for some reason: sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner" sudo apt-get update sudo apt-get install sun-java6-jdk To get it to work, replaced the last 2 lines by: sudo apt-get install sun-java6-jre sun-java6-plugin sudo update-alternatives --config java

diff -qr --exclude=".svn" --exclude=".git" --exclude="STATIC_LIBRARIES" dir1 dir2 q is for brief, which means output only if the files differ r is for recursive since we are comparing directories. we exclude certain directories using the exclude option

Let's say you want to search for the text 'amigo' within a directory. You can use: grep -r 'amigo' /home/guest/mydir. If you start getting errors like 'No such file or directory' and you want to ignore them, the option -s can be used. So it'll become grep -r  -s 'amigo' /home/guest/mydir. Here -r is for recursive search within a directory and -s for skipping error messages. And if we want to exclude searching certain type of files, like SVN and xml files, we can use: grep -r -s -n --exclude=*.{svn*,xml} 'PATTERN' . Another useful feature is if we want to exclude certain directories from the search altogether. For this we can use  --exclude-dir=Tests .

Use 'lsmod' to display all the loaded modules. If the module you are looking for is not visible, you need to load it. For this use 'insmod module_name.ko'. If this still throws errors, you might consider recompiling the .ko files.