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If you receive NRPE error "UNKNOWN: No health status line found", check that you have added "/usr/bin/sudo " into nrpe.cfg before command like this:

command[check_smart]=/usr/bin/sudo /usr/local/nagios/libexec/check_smart -i $ARG1$ -d $ARG2$

And now in the file /etc/sudoers at the end add line:
nagios ALL=(ALL) NOPASSWD:/usr/local/nagios/libexec/check_smart

now try:
/usr/local/nagios/libexec/check_nrpe -H localhost -c check_smart -a ata /dev/sda

and you will got:
OK: no SMART errors detected|Raw_Read_Error_............