Shell Variables and the Environment
The shell has different types of variables: user-defined variables and environment (or predefined) variables. As the name suggests, users create the user-defined variables. Solaris uses environmental variables that determine the work environment of a user. These variables are assigned default values in the system-wide initialization files. If users want to customize their environments, then they can configure these variables according to their preferences. The environment variables have some variables, which are pre-defined, such as HOME, PATH, and so forth. Only the particular shell in which you are working recognizes the environment variables.
The following list explains some standard shell environment variables ...
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