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Ubuntu Unleashed 2013 Edition: Covering 12.10 and 13.04, Eighth Edition by Matthew Helmke

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mod_setenvif

mod_setenvif allows manipulation of environment variables. Using small snippets of text-matching code known as regular expressions, you can conditionally change the content of environment variables. The order in which SetEnvIf directives appear in the configuration files is important. Each SetEnvIf directive can reset an earlier SetEnvIf directive when used on the same environment variable. Be sure to keep that in mind when using the directives from this module.

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