Red Hat Linux 8.0: The Official Red Hat Linux Getting Started Guide
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# Starting Applications

I installed an application I downloaded from the Internet, and everything seemed to go fine, but I still get "command not found" when I type its name. I think I have the right name, so why will it not start?

If you are trying to start an application from the shell prompt and it is not working, try typing out the full directory path before the name of the application's executable (such as `/usr/local/bin/my-executable`).

For example, imagine that you have downloaded the `setiathome` client application and want to try it out. You follow the directions for installing the software, which creates a subdirectory in your home directory called `seti/`. Now, start the application using the full path to the executable file as shown below:

    /home/joe/seti/setiathome

The reason you may need to use the full pathnames in order to start an application is because the executable wasn't placed in a directory where your user shell environment knew it could be found (such as `/usr/local/bin`).

You can customize your settings so that you won't be required to use the type the full path to the application each time. To do this, you will have to edit your PATH environment variable.

## Editing Your PATH

If you frequently start programs that are not located in a directory that your user shell has been configured to search, you will have to edit your user shell configuration file to add the directory containing the executable you wish to run. You can do this by adding the directory to your `PATH` environment variable.

| Caution
| These instructions are intended only for user accounts. Avoid modifying files such as the root user's `.bash_profile`, because of the potential security risks.

Start a text editor, such as pico, at a shell prompt. You can open the file called `.bash_profile` by typing the following:

    pico .bash_profile

You will see a `PATH` statement, similar to the one shown below.

    PATH=$PATH:$HOME/bin:/usr/local/bin:

To the end of this statement, add `./` as shown below:

    PATH=$PATH:$HOME/bin:/usr/local/bin/:$HOME/seti:

Now, type [Ctrl]-[x]; you will be asked whether you want to save "the modified buffer" (that's what Pico calls an updated file); type [y] for "yes." Next, you will see the name the file will be saved as; press the [Enter] key.

You can then make the changes to `.bash_profile` take effect immediately by typing the following command:

    source .bash_profile

By doing the above, you do not have to manually add `./` to the beginning of the executable to start an application located in the directory you've added to your `PATH`.

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