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Tom Lane authored
Historically, psql consulted COMSPEC to spawn a shell in its \! command, but we just invoked "cmd" when spawning shells in pg_ctl and pg_regress. It seems better to rely on the environment variable, if it's set, in all cases. It's debatable whether this is a bug fix or just a behavioral change, so no back-patch. Juan José Santamaría Flecha Discussion: https://postgr.es/m/16080-5d7f03222469f717@postgresql.org
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