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 can 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 bash built in command.

Example - local variables

mv $old_file $new_file

Example - global environment variables

mydepartment=Sales ; export mydepartment
mycustomer='Brown Brothers' ; export mycustomer

"Laughter is America's most important export" ~ Walt Disney


env - Display, set, or remove environment variables.
echo - Display message on screen.
hostname - Print or set system name.
local - Create a function variable.
printenv - Print environment variables.
readonly - Mark variables/functions as readonly.
shift - Shift positional parameters.
unset - Remove variable or function names.
Variables - Local and Environment variables.
Equivalent Windows command: SETX - Set environment variables permanently

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