Shell Programming and Scripting

var1="aaa"
var2="bbb"
etc...

var1= (var 1 from external conf file)
var2 = (var 2 from external conf file)

$ cat /Users/scott/myVars.sh
var1=123
var2=abc

$ cat myScript
. /Users/scott/myVars.sh
echo var1 is $var1
echo var2 is $var2

$ ./myScript
var1 is 123
var2 is abc

        .  filename [arguments]
       source filename [arguments]
              Read and execute commands from filename in the current shell environment and return the exit  status  of
              the  last  command executed from filename.  If filename does not contain a slash, file names in PATH are
              used to find the directory containing filename.  The file searched for in PATH need not  be  executable.
              When  bash  is not in posix mode, the current directory is searched if no file is found in PATH.  If the
              sourcepath option to the shopt builtin command is turned off, the PATH is not searched.   If  any  argu-
              ments  are  supplied,  they  become  the positional parameters when filename is executed.  Otherwise the
              positional parameters are unchanged.  The return status is the status of the last command exited  within
              the script (0 if no commands are executed), and false if filename is not found or cannot be read.