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home-environment: describe session variable values a bit
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@ -128,6 +128,15 @@ in
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description = ''
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Environment variables to always set at login.
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</para><para>
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The values may refer to other environment variables using
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POSIX.2 style variable references. For example, a variable
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<varname>parameter</varname> may be referenced as
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<code>$parameter</code> or <code>''${parameter}</code>. A
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default value <literal>foo</literal> may be given as per
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<code>''${parameter:-foo}</code> and, similarly, an alternate
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value <literal>bar</literal> can be given as per
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<code>''${parameter:+bar}</code>.
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</para><para>
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Note, these variables may be set in any order so no session
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variable may have a runtime dependency on another session
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variable. In particular code like
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