Oracle environment variable
DISPLAY
The name, server number, and screen number of the system where the Oracle Universal Installer display its Graphical User Interface (GUI).
ORA_NLS33
Location of character set data. No
ORACLE_BASE
Directory at the top of the Oracle software and administrative file structure.
ORACLE_HOME
Directory containing Oracle software for a particular release.
ORACLE_SID
The Oracle server instance identifier to use during installation.
PATH
Shell’s search path for executables.
ORACLE_TERM
specifies the terminal definition resource file to be used with the Installer. If ORACLE_TERM is not set, the Installer uses the value of the UNIX environment variable TERM and searches for an equivalent ORACLE_TERM resource
LD_LIBRARY_PATH
a colon-separated set of directories where libraries should be searched for first
NLS_LANG
the client character set,you can refence this doc for details http://www.dbaoncall.net/references/ref_nls_lang.html
TNS_ADMIN
TNS_ADMIN in unix to point to the location listener.ora tnsnames.ora
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