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/usr/share/postgresql/10/extension/plsh--2.sql is in postgresql-10-plsh 1.20171014-1.

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CREATE FUNCTION plsh_handler() RETURNS language_handler
    AS '$libdir/plsh'
    LANGUAGE C;

CREATE FUNCTION plsh_inline_handler(internal) RETURNS void
    AS '$libdir/plsh'
    LANGUAGE C;

CREATE FUNCTION plsh_validator(oid) RETURNS void
    AS '$libdir/plsh'
    LANGUAGE C;

CREATE LANGUAGE plsh
    HANDLER plsh_handler
    INLINE plsh_inline_handler
    VALIDATOR plsh_validator;

COMMENT ON LANGUAGE plsh IS 'PL/sh procedural language';