extract string from filename

[Python]

On Thu, 2006-01-12 at 19:40 -0500, Zhao Peng wrote:
> For example:
> abc_st_nh_num.sas7bdat
> abc_st_vt_num.sas7bdat
> abc_st_ma_num.sas7bdat
> abcd_region_NewEngland_num.sas7bdat
> abcd_region_South_num.sas7bdat

You're not the only one learning here.  

I put these names into a file called str2-test-data

$ cut -d _ -f 2 str2-test-data | sort | uniq
region
st

I think that you could use:
ls | cut -d _ -f 2 | sort | uniq > str2-results.txt

-- 
Lloyd Kvam
Venix Corp