CDO

Hello,
I’m trying to convert many file from rotated coordinate to normal long/lat coordinate. I would like to use the “remapbil” command following this link https://code.mpimet.mpg.de/boards/2/topics/102
It is the first time I use this software, I thought of acting in this way: first use cd to select folder where file is stored, after load file into software CDO, finally select the interesting variables and so doing the resample.
I write to ask some clarifications.
The first looking different tutorial on internet I have not found any command to import files into cdo. Is it correct?
I have many .nc file, each file refers to a considered year and therefore it has 12 bands (one for each month).
The second is relative to select the variables, I use this command line:

“cdo –selname, file name <infile> <outfile>” to select my variable.

I obtain this error message “syntax error next to the unexpected token “<”. Why?

Thanks