Give details on open boot prom commands

OBP(Open Boot PROM) commands are set of commands issued at commnd-line interface when system starts. Also referred to as OBP commands that determine the system statistics, hardware configration and many more internal details about the system. The command-line interface is called as FROTH which will normally be as given below: ok> This prompt is also called as boot prompt. When we want to boot the system,we can issue : ok> boot If we want to boot from OS media we can use: ok> boot disk ok>boot cdrom The system diagnostic information can be obtained by issuing : ok>printenv Command used to set values to various variables(environment variables) when the system enters run levels is: $env - lists the variable values To modify variable values we use: ok>setenv - sets the value of the variables ok>unsetenv - unsets the value