Using Other Methods to Set Environment Variables

All Operating Systems

From within a program: Call the SETENVQQ routine to set environment variables. For example:

USE IFPORT
LOGICAL success
success = SETENVQQ(“FORT9=C:\mydir\test.dat”)

Depending on your operating system, there are additional ways to set environment variables.

Linux* and OS X*

Within the Bourne*/Bourne* Again shell (sh/bash), or the Korn shell (ksh), use the export command and assignment command to set an environment variable:

export FORT9
FORT9=/usr/users/smith/test.dat

To remove the association of an environment variable and its value within the Bourne*, Korn shell, or bash shells, use the unset command:

unset FORT9

setenv FORT9 /usr/users/smith/test.dat

unsetenv FORT9

Windows*

Environment variables in a command prompt session can be set using the SET command. Changes here will affect programs run from that command prompt only. For example:

set FORT9=C:\mydir\test.dat

To remove an environment variable, omit the value. For example:

set FORT9=

To display the current value, use the ECHO command and enclose the environment variable name in the percent signs as shown below:

echo %FORT9%

To display the values of all variables whose names begin with a string, use SET and omit the equal sign as shown below:

set FORT

In Microsoft Visual Studio you can specify environment variables that will be set when a program is run. In the project properties, edit the Configuration Properties > Debugging > Environment property and set the field to a series of name=value pairs separated by semicolons. For example:

FORT9=C:\mydir\test.dat;FOR_FORCE_STACK_TRACE=TRUE

A default set of environment variables is established per user and at the system level. These can be specified through Control Panel > System > Advanced System Settings > Environment Variables.