useradd -d $dir -m -s $shell -u $uid $username is the default. If the file exists but is empty, cp -pr /etc/skel $dir; chown -R $uid.$gid $dir is the default instead. Otherwise the contents of the file are treated as a double-quoted perl string, with the following variables available: $username, $uid, $gid, $dir, and $shell.
userdel $username is the default. If the file exists but is empty, rm -rf $dir is the default instead. Otherwise the contents of the file are treated as a double-quoted perl string, with the following variables available: $username and $dir.
[ -d $old_dir ] && mv $old_dir $new_dir || ( chmod u+t $old_dir; mkdir $new_dir; cd $old_dir; find . -depth -print | cpio -pdm $new_dir; chmod u-t $new_dir; chown -R $uid.$gid $new_dir; rm -rf $old_dir ) is the default. Otherwise the contents of the file are treated as a double-quoted perl string, with the following variables available: $old_dir, $new_dir, $uid and $gid.
[ -e homedir/.qmail-domain-default ] || {
touch homedir/.qmail-domain-default;
chown uid.gid homedir/.qmail-domain-default;
} is run.
identity.pub file to ~root/.ssh/authorized_keys on the remote machine(s).
-t option to ssh-keygen, and append the created id_dsa.pub or id_rsa.pub to ~root/.ssh/authorized_keys2 on the remote machine(s).
PermitRootLogin without-password (meaning with keys only) in your sshd_config file on the remote machine(s).