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sudo userdel username

sudo rm -r /home/username/

sudo useradd username

passwd jsmith

/etc/hosts.deny is checked before /etc/hosts.allow, so you can go

* hosts.deny
ALL : ALL

first, we block everything from everyone,

* hosts.allow
ALL : localhost
sshd: 192.168.0.22
proftpd: 192.168.0.22

sudo mkhomedir_helper jpalma 0022 /etc/skel

useradd -g <groupname> username

groupadd <groupname>

usermod -a -G <groupname> username

usermod -a -G ftp,admins,othergroup <username>