52 Part I . Linux First Steps Table (Web hosting colocation)
52 Part I . Linux First Steps Table 2-6 Bash Configuration Files File Description /etc/profile Sets up user environment information for every user. It is executed when you first log in. This file provides values for your path, as well as setting environment variables for such things as the location of your mailbox and the size of your history files. Finally, /etc/profile gathers shell settings from configuration files in the /etc/profile.d directory. /etc/bashrc Executes for every user who runs the bash shell, each time a bash shell is opened. It sets the default prompt and may add one or more aliases. Values in this file can be overridden by information in each user s ~/.bashrc file. ~/.bash_profile Used by each user to enter information that is specific to his or her own use of the shell. It is executed only once, when the user logs in. By default it sets a few environment variables and executes the user s .bashrc file. ~/.bashrc Contains the information that is specific to your bash shells. It is read when you log in and also each time you open a new bash shell. This is the best location to add environment variables and aliases so that your shell picks them up. ~/.bash_logout Executes each time you log out (exit the last bash shell). By default, it simply clears your screen. The following sections provide ideas about items to add to your shell configuration files. In most cases, you add these values to the .bashrc file in your home directory. However, if you administer a system, you may want to set some of these values as defaults for all of your Linux system s users. Setting Your Prompt Your prompt consists of a set of characters that appear each time the shell is ready to accept a command. The PS1 environment variable sets what the prompt contains. If your shell requires additional input, it uses the values of PS2, PS3, and PS4. When your Linux system is installed, often a prompt is set to contain more than just a dollar sign or pound sign. For example, in Linux systems from Red Hat, your prompt is set to include the following information: your username, your host name, and the base name of your current working directory. That information is surrounded by brackets and followed by a dollar sign (for regular users) or a pound sign (for the root user). Here is an example of that prompt: [chris@myhost bin]$
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