Loading .m file

[pavan padmashali]

Hi!
i'm a beginner in Octave. 

I want to run .m file in Octave on windows. Current directory :C:\Octave\3.2.4_gcc-4.4.0\bin

I saved the code :
clear;
a=10;
b=20;
c=a+b

in runm.m file and saved it in the current directory. 

when i try to run the file by >:runm

it shows an error: "runm" undefined near line 12 column 1. 

What should i do in order to run the .m file?

Thanks in advance.