This section describes some of the more commonly used environment variables. Many of these variables may already be in your user profile. As previously mentioned, your user profile file (.profile for the Bourne and Korn shells and .cshrc for the C shell) is located in your home directory.
Hidden ("dot") files can be listed by typing ls -la.
Specifies the directories to be searched when a unique directory name is typed
without a full path name.
Defines your login name. The default for this variable is automatically set
to the login name specified in the passwd database as
part of the login process. See System Administration Guide, Volume 1 for
information on the passwd database.
Lists, in order, the directories that the system searches to find a program
to run when you type a command. If the appropriate directory is not in the
search path, you have to enter it or else type the complete path name when
you enter a command.
The default for this variable is automatically defined and set as specified in your .profile file (Bourne or Korn shell), or .cshrc file (C shell) as part of the login process.
Defines your command prompt. The default prompt for the Bourne and Korn shells
is the dollar sign ($). The default prompt
for the C shell is the percent sign (%).
The default prompt for root in either shell is the pound sign (#).
Specifies the path name for an unsupported terminal that has been added to
the terminfo database. You do not need to set this variable
for default terminals in this database. See System Administration Guide, Volume II
for information on the terminfo database.
Defines the terminal you're currently using. When you run an editor, the system
searches for a file with the same name as the definition of this variable.
It first searches the path (if any) referenced by the
TERMINFO variable, and then the default directory, /usr/share/lib/terminfo, to determine the characteristics of the
terminal. If a definition is not found in either location, the terminal is
identified as "dumb."