Linux --javac not found

Question

i have installed java according to the instructions given to me in my linux os .
but when i compile i get
bash: javac: command not found.
i have installed in /usr/java/j2sdk1.4.2_06.
i have compiled the program in /usr/java folder.
how do i solve it .

Answer 1

After you've installed the rpm for the java sdk, you will want to add the bin directory of the sdk to the PATH variable. One suggestion that has been given is to edit the file ".bash_profile" in your home directory. You can see the file by listing hidden files ls -all.
You may see something like the following within the file.
PATH=$PATH:$HOME/bin
export PATHTo add the bin directory to the path, simply add a colon, followed by the directory. I've written <whatever> to indicate that you must fill in the specifics, like version etc, of your jdk. The updated file becomes...
PATH=$PATH:$HOME/bin:/usr/java/jdk*<whatever>/bin/
export PATHThis will allow you, and you alone, to run the javac command in the terminal without specifying the entire file path. If you are unfamiliar with Linux and you are the only user on the machine, then I suggest doing it that way.
If on the other hand you have a better understanding of Linux, and the machine and the sdk are to be shared by other users, you will want to make the bin directory available to the System PATH variable. Here's how I did that. Create a file "java.sh" inside the directory "/etc/profile.d". This directory is where some application specific startup scripts are found. The script that you will place here is run by /etc/profile and will set up the PATH variable to include the bin directory of the sdk. Note that you must be logged in as root to create a file within the directory. Also, be careful when creating script files for this directory. The file "java.sh" will contain a single line of text.
export PATH=$PATH:/usr/java/jdk*<whatever>/bin/Once the file is created, be sure that permissions are such that all users can execute the file.
I've found information about setting up a Java development environment on a Linux OS here.
http://home.bredband.no/gaulyk/java/tutorial/javaredhat.html