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Using variables while redirecting input from file?

Using variables while redirecting input from file?

Using variables while redirecting input from file?

(OP)
If I want to test some SQL with the following at the CLI:

psql test < test.sql > test.txt

...is there a way to set a variable with a SELECT, and then use that variable when doing a subsequent INSERT in the test.sql file?

Ideas?

Thanks,
fig

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