Linux user crap
usermod -a -G examplegroup exampleusername
usermod -aG sudo username
$ useradd appadmin1 -u 4100 -g 4100 -m -s /bin/bash
https://stackoverflow.com/questions/23601844/how-to-create-user-in-linux-by-providing-uid-and-gid-options
https://linuxize.com/post/how-to-list-groups-in-linux/
Usage: /sbin/mkhomedir_helper <username> [<umask> [<skeldir>]]
https://serverfault.com/questions/63764/create-home-directories-after-create-users
sudo passwd vivek
https://www.cyberciti.biz/faq/linux-set-change-password-how-to/#google_vignette
lsb_release -a