Hi everyone.
I was trying unsuccessfully to add 150 ZCM Administrators. So I was preparing to make a question but then I solve it. So here is the solution (probably there are easier and better ones):

I have a file adm.txt that has the administrators one for each line.
So I've made the following script (PrepareCommand.sh):
for entry in $(cat ./adm.txt)
echo zman admin-create /Users/bdp.pt/bdp.pt/Utilizadores/$entry >> finalCommand.txt

I run the script PrepareCommand.sh.
Then I run the following script:
zman batch-execute ./finalCommand.txt -U <administrator> -P <administrator password>

Hope this can help someone. If there is a better way please correct me.