login as root
nano /etc/shells
add a line to the list "/bin/nologin"
/bin/bash
/bin/sh
/bin/ash
/bin/bsh
/bin/tcsh
/bin/csh
/bin/nologin
useradd -d /home/remotebackup/user -s /bin/nologin user > /bin/nologin 2>&1
login as root
nano /etc/shells
add a line to the list "/bin/nologin"
/bin/bash
/bin/sh
/bin/ash
/bin/bsh
/bin/tcsh
/bin/csh
/bin/nologin
useradd -d /home/remotebackup/user -s /bin/nologin user > /bin/nologin 2>&1