I'd suggest you open up a terminal, type
and look up the sentence "The environment for any simple command or function may be augmented temporarily by prefixing it with parameter assignments, as described above in PARAMETERS. These assignment statements affect only the environment seen by that command." Or the section "Simple commands & pipelines" in
in case you're using zsh. Feel free to read the manual of YOUR shell and find the appropriate documentation. And then try to understand it.
Thank you very much.
--spiney 23:56, 22 February 2006 (CET)