grep problem

[Johan Smets]

Dear gnu,

I have small problem. we have some large files like this

xxxxx_MICHIGAN_001_HIGHPRESSURE
xxxxx_NEWYORK_001_LOWPRESSURE
xxxxx_MICHIGAN_002_HIGHPRESSURE

and this continues with a lot of cities. there over 3000 lines in a file
so we want to filter a specific city

so we say

grep mich ALM150605.STR > test.txt

so we are going to search for every line with mich in it in the file
ALM150605.STR and we write every matching line to a text file named test.
but this does not work.

Regards