Document clearly that psql \! parameter interpretation limitations are

the same as \copy.

diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index a47af51b9dd924ee4fbfb6da80fa16f2ad3237c7..4b5e5274e5a33e909875733f795144f8ed13cc82 100644 (file)
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -2450,7 +2450,8 @@ testdb=> \setenv LESS -imx4F
         Escapes to a separate Unix shell or executes the Unix command
         command. The
         arguments are not further interpreted; the shell will see them
-        as-is.
+        as-is.  In particular, the variable substitution rules and
+        backslash escapes do not apply.