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(I suspect the answer is yes, but I don't see it confirmed anywhere.)

In psql we can set environment variables using the \setenv {name} {value} command.

Are these the same environment variables as the ones in the shell?

For reference the relevant page in the documentation.

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Yes. \setenv just calls the C library function setenv(). This changes the environment settings of the psql process and has no effect outside of that.

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  • So what happens to an environment variable when we exit a psql session in which it was changed?
    – Niels Bom
    Commented Oct 14, 2022 at 13:57
  • 2
    It disappears along with the process.
    – user234725
    Commented Oct 15, 2022 at 5:07

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