[check_postgres] check_postgres.pl does not use;

[He, Guoya (EXT - CN/Shanghai)]

Hello,
       I meet a problem when I used check_postgres.pl. I can used "./check_postgres.pl -H localhost -p 5432 --db reviewdb --dbuser=*** --dbpass=***  --action  backends"this command, but I canot used "./check_nrpe -H 127.0.0.1 -c check_postgres_backends". This error occurred (ERROR: Could not find a suitable psql executable);
  I hope you can give me help, thank you very much.
Thanks & Regards,
Evan
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