select keyword from file

[gca07738]

data.txt

employee_Name,Dept_ID,employee_id
Peter,A001,0001
Mary,A006,0002
.......

I have one file(data.txt) and how can I select all matched date if Dept_ID=A001?
what i can do is select each line one by one and check if the A001 is matched.Is there a easy way to do?

[kevinc]

No, not really. The way you've proposed is fine, and probably the easiest way to do it. You could use regular expression matching, but that'd get a bit complex for something so simple. Rather just read in each line, check the correct element and determine it like that. If you're wanting to run selective queries such as those, you'd be better off using a database such as mySQL.