Looping through a text file that contains a list of groups

Hi everyone hope you are all well.

Guys I have the following command that does what Id like but it only does it on ONE group specified, as the following shows:

dsquery group -name "AU-SG GROUPX" | dsget group -members | dsget user -samid

Output of the above command gives a list of users for the group AU-SG GROUPX, as the following shows:

samid
msimons
ajones
 tsmith


What id like to do is the following:

Instead of having to input the group name after the -name switch, as follows:
dsquery group -name "AU-SG GROUPX" | dsget group -members | dsget user -samid

Id like to be able to point the -name switch to a text file of group names, then loop through each group name in a text file, and output the usernames.

eg.

dsquery group -name c:\groups.txt | dsget group -members | dsget user -samid

Any help on this greatly appreciated.