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Clarify initdb --sync-only help message and docs
The initdb help message for --sync-only was a bit terse, and not really self-explanatory. Make it clearer that initdb --sync-only will exit after syncing, and expand the docs with a note on when the option can be useful. Also align the help output with others that exit immediately. Author: Nathan Bossart, Gurjeet Singh Discussion: https://postgr.es/m/CABwTF4U6hbNNE1bv=LxQdJybmUdZ5NJQ9rKY9tN82NXM8QH+iQ@mail.gmail.com
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@ -306,6 +306,9 @@ PostgreSQL documentation
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<para>
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Safely write all database files to disk and exit. This does not
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perform any of the normal <application>initdb</application> operations.
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Generally, this option is useful for ensuring reliable recovery after
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changing <xref linkend="guc-fsync"/> from <literal>off</literal> to
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<literal>on</literal>.
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</para>
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</listitem>
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</varlistentry>
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@ -2200,7 +2200,7 @@ usage(const char *progname)
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printf(_(" -N, --no-sync do not wait for changes to be written safely to disk\n"));
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printf(_(" --no-instructions do not print instructions for next steps\n"));
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printf(_(" -s, --show show internal settings\n"));
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printf(_(" -S, --sync-only only sync data directory\n"));
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printf(_(" -S, --sync-only only sync database files to disk, then exit\n"));
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printf(_("\nOther options:\n"));
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printf(_(" -V, --version output version information, then exit\n"));
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printf(_(" -?, --help show this help, then exit\n"));
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