How to have environment variables reference other environment variables

 If you want to define a sequence of environment variables in a job, where one variable references a previously assigned variable, e.g.

ORACLE_BASE=/u01/app/oracle

ORACLE_HOME=$ORACLE_BASE/product/10.2.0.3

there are two options.

If this affects a small number of jobs, you can create the variables as commands, see the first attachment.

If there are a lot of jobs, create a file as in the second attachment, and reference it in the job as in the third attachment.

This applies to *NIX.  For Windows, for the first case you can follow a similar approach using

set A=value

set V=%A%added

and for the second case, you can create a .bat file that sets the required variables, then specify that in the job's command, ie

the file set_vars.bat contains

set A=value

set V=%A%added

and the job's commands are

set_vars.bat

first_command ...

and so on.