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Docs: document that psql's "\i -" means read from stdin.
This has worked that way for a long time, maybe always, but you would not have known it from the documentation. Also back-patch the notes I added to HEAD earlier today about behavior of the "-f -" switch, which likewise have been valid for many releases.
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@ -192,7 +192,10 @@ EOF
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<para>
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If <replaceable>filename</replaceable> is <literal>-</literal>
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(hyphen), then standard input is read.
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(hyphen), then standard input is read until an EOF indication
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or <command>\q</> meta-command. Note however that Readline
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is not used in this case (much as if <option>-n</option> had been
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specified).
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</para>
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<para>
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@ -1783,6 +1786,13 @@ hello 10
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class="parameter">filename</replaceable> and executes it as
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though it had been typed on the keyboard.
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</para>
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<para>
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If <replaceable>filename</replaceable> is <literal>-</literal>
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(hyphen), then standard input is read until an EOF indication
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or <command>\q</> meta-command. This can be used to intersperse
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interactive input with input from files. Note that Readline behavior
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will be used only if it is active at the outermost level.
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</para>
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<note>
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<para>
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If you want to see the lines on the screen as they are read you
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