presto-cli/src/main/java/io/prestosql/cli/Pager.java/Pager/create
class Pager:    public static Pager create()
    {
        String pager = System.getenv(ENV_PAGER);
        if (pager == null) {
            return create(LESS);
        }
        pager = pager.trim();
        if (pager.isEmpty()) {
            return createNullPager();
        }
        return create(ImmutableList.of("/bin/sh", "-c", pager));
    }