All CAS client programs use the following environment variables to determine the appropriate URL to connect to and server identity to expect. In all cases, the command line options takes precedence over the environment variables.

The URL is determined using this algorithm:
- If the -c command line option was specified, the URL specified with that option is used.
- Otherwise, the CAS_SERVER_URL environment variable must be set, and its value is used.
The server identity (i.e. the expected subject name of the CAS server certificate) is determined as follows:
- If the -s command line option was specified, the value specified with that option is used as the identity
- Otherwise, if the CAS_SERVER_IDENTITY environment variable is set, the value of that variable is used as the expected server identity. Ensure that the value is enclosed within double quotes if there are spaces in the DN. The double quotes are required by the CAS scripts when they are run from a Windows shell, although the shell does not require it even if the value has spaces.
- If neither is set, host authorization is done and the expected server credential is cas/<fqdn>, where <fqdn> is the fully qualified domain name of the host on which the CAS service is up.

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