Are Linux usernames case sensitive?

Related questions

1. Is Samaccountname case sensitive?
2. Are Windows usernames case sensitive?
3. Why is Linux case sensitive?
4. Does it matter if an email address has capital letters?
5. Are usernames case sensitive?
6. What is a Unix username?
7. What is Ldapsearch?
8. Is LDAP search case sensitive?
9. Are Windows case sensitive?
10. Do capital letters matter in Gmail email addresses?

Tags

1. #produce
2. #unwanted
3. #terminals
4. #avoided
5. #usernames
6. #early
7. #should
8. #sensitive
9. #results
10. #generally
11. #common
12. #uppercase
13. #definitely
14. #systems
15. #using
16. #hardware
17. #characters