Q. How do I create username or user groups in upper case under Linux / *BSD / UNIX operating systems?
You can create username and groups in upper case but I don’t recommend it for following problems:
(a) Confusion – Some user may get confused with username VIVEK and vivek.
(b) Compatibility issues – Many protocols and certain libraries may produced compatibility issues.
The use of upper case letters for usernames or group names should be avoided under Linux / UNIX like operating systems.
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Category | List of Unix and Linux commands |
---|---|
File Management | cat |
Firewall | Alpine Awall • CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04 |
Network Utilities | dig • host • ip • nmap |
OpenVPN | CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04 |
Package Manager | apk • apt |
Processes Management | bg • chroot • cron • disown • fg • jobs • killall • kill • pidof • pstree • pwdx • time |
Searching | grep • whereis • which |
User Information | groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w |
WireGuard VPN | Alpine • CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04 |
can be done by upgrading the package shadow-utils, after that you will be able to add the username with upper/lower characters
You use the shift key on the keyboard. I’d say reason ‘a’ is the only one.