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Set an environment variable. Mark each name to be passed to child processes in the environment.
      export [-fn] [-p] [name[=value]]

      -f   The names refer to shell functions; 
           otherwise the names refer to shell variables
      -n   No longer mark each name for export.
      -p   Display output in a form that may be reused as input. 

If no names are supplied, or if the `-p' option is given, a list of exported names is displayed.

The return status is zero unless an invalid option is supplied, one of the names is not a valid shell variable name, or `-f' is supplied with a name that is not a shell function.

export is a BOURNE shell command and a POSIX `special' builtin.

Example - local variables


mv $v_old_file $v_new_file

Example - global variable:

v_department=Sales ; export v_department
v_customer='Brown Brothers' ; export v_customer

Related commands:

env - Display, set, or remove environment variables
echo - Display message on screen
exit - Exit the shell
function - Define Function Macros
hostname - Print or set system name
local - Create variables
printenv - Print environment variables
readonly - Mark variables/functions as readonly
shift - Shift positional parameters
unset - Remove variable or function names