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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Debraj Manna <subharaj.manna@gmail.com>
cc: pgsql-admin <pgsql-admin@postgresql.org>
Subject: Re: Default locale in postgres
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Debraj Manna <subharaj.manna@gmail.com> writes:
> Can someone let me know if I am not passing any locale while doing initdb
> what locale (Collate & Ctype) will postgres 9.5.4 pick?

Whatever is the prevailing default in initdb's environment ---
see LANG and LC_XXX environment variables.

If none of those are set, I imagine it'll fall back to C locale,
though this choice is possibly dependent on your local libc.
"man locale" might be informative.

			regards, tom lane