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You can use the -N parameter to overwrite existing files when downloading with wget. For example: wget -N https://www.dangtrinh.com/afile.txt

To mass enroll users into a Moodle course, you can use the upload users csv file method as following: Assuming: All the student accounts are in Active Directory and being used to login into Moodle All student (in the csv file) will be enrolled into my-course-short-name course. 1. Prepare the csv file with student information, let's call it students.csv: idnumber,lastname,firstname,email,username,auth,course1,type1,role1,enrolstatus1 102340,Joe,Student One,jstudent1@my.moodle,jstudent1,ldap,my-course-short-name,1,student 102342,Joe,Student Two,jstudent2@my.moodle,jstudent2,ldap,my-course-short-name,1,student ... 2. Go to Site administration > Users > Accounts > Upload users to upload students.csv 3. In the Upload users preview screen, config as following: 4. Click Upload users to finish.